... Abstract : MEASUREMENT OF THE AC MAGNETIC SUSCEPTIBILITY OF A LARGE, WEAKLY MAGNETIC OBJECT HAS ADVANTAGES OVER DC ...

... Abstract : A mutual inductance bridge for measuring ac magnetic susceptibility at low frequencies, using standard components, is described. ...

The nonlinear diffusion of magnetic flux into a superconducting sample can be studied by measuring the relaxation of the magnetisation after application of a step field or by measuring the ac susceptibility, (chi)(sub 1) and its third harmonic, (chi)(sub ...

A mutual inductance bridge for measuring ac magnetic susceptibility at low frequencies, using standard components, is described. The equivalent of a decade mutual indicator is achieved by using a commercial decade autotransformer in combination with a sma...

Magnetization and ac susceptibility of a standard NbTi superconductor were measured as a function of longitudinal dc magnetic field. The ac-field-amplitude and frequency dependences of the complex susceptibility are examined. The magnetization is related to the ...

The report deals with hysteresis losses at 4 K measured by magnetization and complex magnetic susceptibility. The theoretical and experimental relationships between ac susceptibility and magnetization as functions of dc field were examined in terms of the...

Residual resistivity ratio RRR is an important integral characteristic of material purity. It was proposed to determine the RRR on base of the AC susceptibility. AC susceptibility of a number of single crystal niobium samples of different orientations types ( <100>, <011,><111> rpar; and ...

The intra- and intergranular superconducting correlations in YBa2Cu3O7?? are characterized by the ac susceptibility measurements. The effective susceptibility is measured as a function of temperature by the Electron-Spin-Resonance (ESR) method, using two DPPH paramagnetic markers placed on the ...

They measured the first and higher components of ac susceptibilities of melted YBCO samples before and after hydrogenation by (mu)s pulsed electrolysis. First component was measured versus temperature at fixed frequency while higher harmonics were measure...

... AC susceptibility measurements near the critical temperature of a Y-Ba-Cu-O superconductor, in: "High Temperature Superconductors," DU ...

A magnetic field harmonically varying in time (to probe the sample) and a lock-in technique (to register the sample response sensed by a pick-up coil) are widely used for characterizing superconductors. Measuring the temperature dependence of the complex AC susceptibility is the most common procedure of this type. This paper reviews ...

The complex ac susceptibility ?' ? j?'' of a pair of distant square superconducting twin films is calculated based on the critical-state model with a constant critical current density Jc. The results are compared with the measured ones of several pairs of square superconducting films. The theoretical and experimental results agree ...

In-phase ?n? and out-phase ?n? components of nth harmonics of AC susceptibility with measuring parameters of a DC magnetic field Bdc, an amplitude Ba and a frequency f of the superimposed AC magnetic fields give substantial information of the superconducting properties. In low-Tc metallic superconductors, ?1? shows ...

Results are reported of low magnetic field studies of dc magnetic susceptibility and ac magnetic susceptibility of bulk samples and powders. These data are analyzed and compared with the microstructures and compositions of the samples as determined by scanning electron microscopic micrographs, X-ray and chemical analysis. Particular ...

Aging dynamics was investigated in the glassy states of poly(2-chlorostyrene) by measuring the complex electrical capacitance during aging below the glass transition temperature. The variations with time and temperature of the ac dielectric susceptibility and volume could be determined by simply measuring the ...

Aging dynamics was investigated in the glassy states of poly(2-chlorostyrene) by measuring the complex electrical capacitance during aging below the glass transition temperature. The variations with time and temperature of the ac dielectric susceptibility and volume could be determined by simply measuring the ...

We performed detailed ac susceptibility measurements on Pr1-xAgxMnO3 (x=0.15,0.20) manganites and observed unusual and interesting features, which are associated with the domain walls and the effects of grain-boundaries on their movements. It is shown that the ac field, frequency, temperature, thermal cycling, and ...

The DC magnetization and AC complex magnetic susceptibilities were measured for MgB2 single crystals, unsubstituted and carbon substituted with the composition of Mg(B0.94C0.05)2. The measurements were performed in AC and DC magnetic fields oriented parallel to the c-axis of the crystals. From ...

AC susceptibility of magnetic markers in solution was studied for biosensor applications. First, frequency dependence of the susceptibility was measured, and size distribution of the markers was estimated by analyzing the experimental result with the so-called singular value decomposition (SVD) method. The size ...

S>Models describing the ac behavior due to sunface superconductivity can be extended to include frequency effects. It is necessary to take normal currents into account and to assume that superconducting currents can only change under the influence of electrical fields. The model has been verified by means of susceptibility ...

The AC susceptibility (X(prime), X(double prime)) has bee measured in a single crystal of the organic superconductor K-(ET)(sub 2)Cu(NCS)(sub 2) ((Tc) = 9.5 K) as a function of the DC magnetic field, for several frequencies (10 (sup 2) Hz

An ac mutual inductance bridge for magnetic susceptibility measurements of solid3He in a metallic cell at ultralow temperatures is described. A null detector for the bridge was composed of an rf-biased superconducting quantum interference device (rf-SQUID) system and a lock-in amplifier that avoided strong fields of the nuclear ...

The AC susceptibility (X{prime}, X{double_prime}) has bee measured in a single crystal of the organic superconductor K-(ET){sub 2}Cu(NCS){sub 2} ({Tc} = 9.5 K) as a function of the DC magnetic field, for several frequencies (10 {sup 2} Hz AC fields (l{mu}T

Laser-polarimetric technique with the shot-noise-limited polarimetric sensitivity is used to study magnetic ac-susceptibility in holmium doped LiYF4 crystals in the range of Zeeman energies comparable with that of the hyperfine interaction in Ho3+ ions. Specific features of optical methods of magnetic measurements, the experimental setup, and results of ...

AC susceptibility measurement of magnetic markers in solution was applied to biological immunoassays. In this method, the markers that bound to biological target can be detected in the presence of unbound markers. The bound markers were distinguished from the unbound ones by using their different frequency dependence of ...

We introduce a new method to measure the elastic constants of globular proteins. Gold nanoparticles, tethered to a gold surface by the protein, are driven by an ac electric field while their displacement is synchronously detected by evanescent wave scattering, yielding the mechanical response function of the macromolecular sample in the frequency domain. ...

We introduce a new method to measure the elastic constants of globular proteins. Gold nanoparticles, tethered to a gold surface by the protein, are driven by an ac electric field while their displacement is synchronously detected by evanescent wave scattering, yielding the mechanical response function of the macromolecular sample in the frequency domain. ...

We have performed multiprobe experiments using a Bridgman-anvil pressure cell, adapted to trap Daphne oil as pressure medium. Resistivity, ac-magnetic susceptibility, thermopower, and ac-heat capacity of a type-I superconductor, lead, have been studied at low temperature up to 5+/-0.1 GPa. This is the first report where ...

Measurements of both the ac magnetic susceptibility in melt processed and film Y{endash}Ba{endash}Cu{endash}O and frictional losses of spinning permanent magnets levitated above Y{endash}Ba{endash}Cu{endash}O are presented. A direct correlation is observed only when large susceptibility samples are studied ...

The low-field dependence of electrical power absorption and ac susceptibility-temperature measurements are performed on three ceramic superconductors of the Tl2Ba2CaL-1CuLO4+2L family using modulated and direct microwave and ac methods. Below a critical temperature all samples exhibit a large increase in ...

The low-field dependence of electrical power absorption and ac susceptibility--temperature measurements are performed on three ceramic superconductors of the Tl{sub 2}Ba{sub 2}Ca{sub {ital L}{minus}1}Cu{sub {ital L}}O{sub 4+2{ital L}} family using modulated and direct microwave and ac methods. Below a critical ...

In this thesis, we studied physical properties of various high-rm T_{c} superconductors by means of the ac susceptibility technique. We presented the physics of ac susceptibility from first principles without relying on any specific models. From this, we could explain some fundamental but interesting features of ...

Magnetization, ac-susceptibility, and muon spin-relaxation (?SR) measurements have been performed in neutral phthalocyaninato lanthanide ([LnPc2]0) single-molecule magnets in order to determine the low-energy levels structure and to compare the low-frequency spin excitations probed by means of macroscopic techniques, such as ac ...

Metal - superconductor (YBCO) systems have been prepared and characterized by resistivity, ac susceptibility and dc SQUID magnetic moment measurements. The silver composites showed superconducting transition for all the composites processed and the superc...

Researchers report the measurements of the I(sub c)(T) of the 102 K phase. They also discuss briefly the composition of the lattice parameters and the ac susceptibility relation to the grain size and microstructure.

A technique for the determination of the critical current of superconducting thin films by a current-dependent ac susceptibility measurement has been developed. This method has been used to characterize superconducting YBa2Cu3O(7-x) films grown in situ at 1073 K by metalorganic chemical vapor depositon. Two superconducting phases with ...

A technique for the determination of the critical current of superconducting thin films by a current-dependent ac susceptibility measurement has been developed. This method has been used to characterize superconducting YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} films grown {ital in situ} at 1073 K by metalorganic chemical vapor ...

Susceptibility to the Cry1Ac toxin from Bacillus thuringiensis in tobacco budworm, Heliothis virescens (F.) (Lepidoptera: Noctuidae), is usually measured by performing bioassays under laboratory conditions. Accurate comparison of Cry1Ac susceptibility among H. virescens samples conducted in ...

We report on the development of a sensitive high frequency susceptometer capable of measuring in the frequency range from 25 kHz up to 10 MHz with a volume susceptibility sensitivity of 3.5�l0-5 at 100 kHz corresponding to about 0.3% of the measured AC susceptibility. In combination with the ...

A novel multiplexed sensing scheme based on the measurement of the magnetic susceptibility of the affinity captured target molecules on magnetic nanoparticles in liquid suspension is proposed. The AC magnetic susceptibility provides a measurement of Brownian relaxation behavior of biomolecules ...

The temperature dependence of the inverse magnetic susceptibility of both Mn12-ac and Mn12-ac-MeOH is found to give finite temperature intercepts, indicating a ferromagnetic phase at low temperature [1, 2]. A magnetic field applied transverse to the Ising axis suppresses the Curie temperature, TCW, to a T = 0 quantum critical point. ...

We will present the physical properties of a layered silver oxide Ag5Pb2O6. The resistivity shows T2 dependence in an unusually wide range of temperature, up to room temperature. Considering the specific heat, this T2 dependence is not attributable to either strong electron correlation or strong electron-optic phonon interaction. In the AC susceptibility ...

Substituted strontium ferrite SrFe12-xCrx/2Alx/2O19 (x=0-2.5) was prepared by sol-gel method. Ac susceptometer, and 57Fe M�ssbauer spectroscopy were used to analyze the structure, static and dynamic magnetic properties of the prepared samples. M�ssbauer spectra show that Al-Cr ions preferentially occupy the 12k sites. Magnetic dynamics of the samples was studied by the ...

We analysed magnetic nanoparticle biodistribution, before and after cytokine conjugation, in a mouse model by ac susceptibility measurements of the corresponding resected tissues. Mice received repeated intravenous injections of nanoparticle suspension for two weeks and they were euthanized 1 h after the last injection. In general, ...

... Title : AC IMPEDANCE MEASUREMENT OF ENVIRONMENTAL ... OF INTERFACIAL IMPEDANCE MEASUREMENT ARE ... OF THE METHOD IN ...

The field amplitude and frequency dependent complex ac susceptibility ?(Hm, f) of four Y-Ba-Cu-O discs made by a top-seeded melt growth technique has been measured at 77 K with the ac field applied parallel to either the disc axis (the c axis of the grain) or its radius (the ab plane of the grain). The results are ...

The complex susceptibility was measured on various magnetic core-shell nanoparticle suspensions in the frequency range between 100 Hz and 1 MHz and compared to theoretical models. It is shown that the spectrum of the imaginary part of the ac susceptibility ?'' measured on aqueous suspensions of ...

Susceptibility to the Cry1Ac toxin from Bacillus thuringiensis in Heliothis virescens is usually measured by performing bioassays under laboratory conditions. Currently there is great interest and research devoted to this insect because it is one of the main targets of B. thuringiensis-expressing tr...

The author of this thesis has measured the AC magnetic response function mu = mu'+i-mu'' in melt-powder-melt-growth YBa2Cu3O7 (Y123) with insulating Y2BaCuO5 (Y211) and in single crystal YBa2Cu3O7 (SC) in applied DC fields up to 8 T, oriented both paralle...

Magnetic measurements (ac and dc susceptibilities and magnetization) on YbCoGaO4 single crystal as a function of frequency and temperature are presented. The studied system behaves like a three-dimensional Ising-like spin glass. A cusp is seen only in the longitudinal susceptibility, whereas a paramagnetic behavior ...

The magnetic properties of several powder samples of the high-Tc superconductors Hg-1212 and (HgTl)-1212 are investigated by means of ac and dc susceptibility measurements. The temperature dependence of irreversibility fields is determined up to magnetic fields of 14 T. It can be described in the framework of a depinning model ...

A commercially available powder of MgB2 is used as starting material for the examination of the influence of the annealing temperature on the properties of this intermediate-Tc superconductor. We performed scanning electron microscopy (SEM) and Hall ac-susceptibility measurements as a function of temperature and ac-field amplitude on ...

ac susceptibility measurement of magnetic markers in solution was performed for the liquid phase detection of biological targets. First, the properties of the magnetic markers were clarified, such as size distribution, frequency dependence of susceptibility, and field dependence of magnetization. Next, we ...

susceptibility peaks are reported for the title complexes. The influences of the ligands on the magnetic; accepted 31 August 1999 Abstract The syntheses and magnetochemical properties of the title complexes to resonant magnetization tunneling. Both the DC and AC susceptibility measurements indicate the difference

Static spin polarization of Fe moments in a spin glass AuFe, determined by zero-field mu SR, is compared to an ac-susceptibility measurement below the cusp temperature T/sub g/, and a rather uniform amplitude of the static polarization is pointed out for ...

Magnetic poly(methyl methacrylate) nanocomposites were prepared using oleic acid coated cobalt ferrite and magnetite nanoparticles. Both nanofillers had a similar effect in shifting the glass transition temperature from that of the neat polymer. The cobalt ferrite nanocomposite had magnetic hysteresis at 2 and 300 K and the magnetite nanocomposite had magnetic hysteresis at 2 K and ...

DC and AC magnetic measurements were carried out to clarify the difference in the magnetic ground state depending on the kinds of Z element used in the martensite phase in Ni�Mn�Z (Z = In, Sn and Sb) off-stoichiometric Heusler alloys. Magnetic field cooling effects were observed in the DC thermomagnetization curves in the low temperature regions, and a ...

DC and AC magnetic measurements were carried out to clarify the difference in the magnetic ground state depending on the kinds of Z element used in the martensite phase in Ni-Mn-Z (Z = In, Sn and Sb) off-stoichiometric Heusler alloys. Magnetic field cooling effects were observed in the DC thermomagnetization curves in the low temperature regions, and a ...

Reducing AC loss in a superconducting apparatus is one of the most important issues, and the precise measurement and estimation of AC losses are essential to reduce them. The four-terminal method is universally used as an electric measurement method of AC losses for superconducting tapes and ...

Low field magnetic measurements of a re-entrant system Ni{sub 81}Mn{sub 19} as a function of temperature are shown to exhibit two successive transitions. The ac susceptibility shows strong frequency dependence due to the frustrated spins. The freezing temperature, T{sub f}, shifts to higher temperatures with increasing frequency and ...

... PROPERTIES), INTERMETALLIC COMPOUNDS, MAGNETIC MATERIALS, SAMARIUM, YTTERBIUM, PRASEODYMIUM, NIOBIUM ALLOYS ...

The ac susceptibility and magnetization curves of a glued Dy(2)O(3) powder sample are measured by an ac susceptometer and a dc superconducting quantum interference device magnetometer, both of which have been calibrated previously. It is shown that the magnetic moment of the paramagnetic sample as a function of ...

We have compared the structure parameters of magnetic core-shell nanoparticles determined from fluxgate magnetorelaxometry measurements applying the moment superposition model with the results from other methods. For the characterization of the magnetic cores, the nanoparticles are immobilized by freeze-drying. The core size distribution estimated for superparamagnetic Fe3O4 ...

Ac susceptibility is used to measure a small shift of the coupling peak of the imaginary part of the ac susceptibility (?'') to a higher temperature as the frequency is increased. Applying the Bean model one obtains the zero-field and zero-temperature intergranular pinning potential U(0,0) and ...

Magnetisation studies on nickel nano particles of different sizes viz. 4 and 12 nm are reported. Magnetisation measurements showed a hump with peak temperature (Tmax) at 17.3 K in ZFC for both the samples with average grain size of 4 nm and 12 nm. AC Susceptibility measurements showed a systematic shift of Tmax to ...

The magnetic and superconducting properties of TmRh/sub 4/B/sub 4/ (which becomes superconducting at 9.6 K) by means of ac and dc magnetic susceptibility and specific heat measurements are investigated. At 10.7 K, an ac susceptibility peak similar to those found in spin glasses has been ...

We have measured the temperature dependence of the ac susceptibility of a polycrystalline Y+2 at. % Gd sample between 4.2 and 10 K in static biasing fields of 0, 40, 80, 240, and 560 Oe. The susceptibility peak temperature T/sub 0/(H) moves downward, while the peak amplitude chi(H,T/sub 0/(H)) remains unchanged in ...

We present our investigation on the critical behavior of the spinel compound CdCr2S4 via the ac susceptibility and dc magnetization measurements. The analysis of ac susceptibility in terms of scaling behavior yields exponent values of ?=5.38+/-0.01, ?+?=1.77+/-0.03 and ?=1.44+/-0.02. Both ? and ...

The ternary intermetallic compound Gd2Au2Cd , synthesized by reaction of the elements via inductive melting, is studied for its structural and physical properties. Gd2Au2Cd crystallizes with the Mo2FeB2 type (an ordered derivative of U3Si2 structure), space group P4/mbm . The magnetic measurements (ac and dc susceptibility) ...

The AC magnetic susceptibilities ?AC of a Bi2223 sintered sample were measured by the Hartshorn bridge method. The linear AC?'0 showed the two-steps behavior at TC1 and TC2, where TC1 > TC2. The ?'0-data between TC1 and TC2 has no HAC-dependence and agreed well with those of powder specimen, ...

A fully automatized alternating current (ac) susceptometer is constructed for simultaneous measurements of the phase resolved complex linear and complex nonlinear ac susceptibilities of lossy and dispersive dielectric materials. This relatively simple setup allows measurements over a wide range ...

In-situ SANS and ac-susceptibility measurements have provided evidence for a first-order Bragg glass transition into a disordered vortex state in a Nb single crystal. This transition manifests itself in the peak effect (PE) in the critical current density, widely believed to be associated with the sudden softening of the vortex lattice. Subsequent studies ...

The transport properties and the dynamics of the flux lines have been investigated on YBaCuO melt textured by measuring the AC susceptibility harmonics as function of the temperature, at different frequencies and amplitudes of the AC magnetic field. The interpretation of the behavior of the experimental curves has ...

New organic inorganic hybrid material composed of typical single-molecule magnet [Mn12(CH3COO)16(H2O)4O12]�2CH3COOH�4H2O (Mn12-acetate) and photochromic azobenzene in PMMA cast films was prepared to observe novel photomagnetic phenomenon. We characterized it by means of UV visible absorption and IR spectra to confirm photoisomerization of azobenzene even at room temperature. We ...

Linear and non-linear dynamic properties of a re-entrant ferromagnetic polycrystalline bulk La0.85Ca0.15Mn0.95Fe0.05O3 sample are studied using AC susceptibility. The Fe doped La0.85Ca0.15Mn0.95Fe0.05O3 undergoes a ferromagnetic transition at TC = 174 K and to spin glass (SG) at Tg� 100 K, and a decrease in the AC ...

Transgenic cotton, Gossypium hirsutum L., producing Cry1Ac and Cry2Ab2 insecticidal proteins from Bacillus thuringiensis (Bt) was first planted in Burkina Faso (West Africa) in 2008. Here, we provide the first baseline data on susceptibility of Helicoverpa armigera (H�bner) (Lepidoptera: Noctuidae) populations collected in West Africa (Benin, Cameroon, ...

The relaxation dynamics in molecular nanomagnets can be probed by measurements of NMR 1/T(1). By modelling magnetoelastic interactions, we theoretically investigate the behaviour of the prototype Fe(8) nanomagnet. The results of our model are in agreement with AC susceptibility and recent NMR measurements. ...

The magnetic noise of a frozen ferrofluid made of maghemite nanoparticles dispersed in glycerin is measured using a two-dimensional electron gas based quantum well Hall sensor (QWHS) with the spinning current technique. The frozen ferrofluid shows a superspin glass transition at 67 K. Below this glass transition temperature, the relation between the imaginary part of the ...

Two measurement techniques, both relying on reversible rotations of the magnetization, have been used to determine the magnitude of the interfacial exchange energy (IEE) between ferromagnetic and antiferromagnetic (F/AF) layers. One technique is to use the anisotropic magnetoresistance to determine rotations of the magnetization away from the unidirectional easy axis, where ...

Nanoparticles of zinc substituted Mg-ferrite with compositions Mg(1- x)Zn x Fe2O4 ( x = 0.15, 0.30 and 0.50) having particle sizes in the range 6.4 nm to 21.4 nm prepared by the co-precipitation method were characterized by 57Fe M�ssbauer spectroscopy, X-ray diffratometry and AC magnetic susceptibility measurements. M�ssbauer ...

We report evidences for bulk nature and unconventional superconductivity in CeIn3 at P=2.65 GPa revealed by the measurements of nuclear-spin-lattice-relaxation time (T1) and ac-susceptibility (ac-?). Both the measurements of ac-? and T1 have pointed to a superconducting transition at T=95 mK, ...

The field-tuned ac susceptibility of Mn12Ac single crystal has been measured as functions of temperature and frequency. Two relaxation processes appear in our measurement. One is related to the magnetic quantum tunnelling of a collective spin S = 12 by a 61 K magnetic barrier and it has been ...

We report evidence for unconventional superconductivity in CeIn3 at a pressure P=2.65 GPa above the critical pressure (Pc~2.5 GPa) revealed by measurements of the nuclear-spin-lattice-relaxation time (T1) and ac susceptibility (ac-?). Both measurements of T1 and ac-? have ...

Commensurability effects between the superconducting flux line lattice and a square lattice (period d=1{micro}m and diameter D=0.4{micro}m) of submicron holes in 1500 {angstrom} vanadium films were studied by atomic force microscopy, DC magnetization, AC susceptibility, magnetoresistivity and I-V measurements. Peaks in the ...

Superconducting quantum interference (SQUID) magnetometers remain as the most sensitive instruments to measure magnetic properties. However, the ready availability and rapid improvements in the sensitivity of magnetic field sensors based on giant magnetoresistance (GMR) effect combined with their low cost and ability to operate at room temperature opens up opportunities to ...

Low-temperature measurements of the ac magnetic susceptibility along the [110] direction of a single crystal of the dipolar spin ice material Ho2Ti2O7, in zero static field, are presented. While behavior that is qualitatively consistent with previous work on Ho2Ti2O7 and the related material Dy2Ti2O7 is observed, this work extends ...

... Accession Number : AD0401563. Title : METHODS OF MEASURING MAGNETIC SUSCEPTIBILITY. Corporate Author : LIBRARY ...

The effect of the doping of rare earth Gd3+ ions replacing Nd3+ in Nd0.7Sr0.3MnO3 is investigated in detail. Measurements of resistivity, magnetoresistance, magnetization, and linear and nonlinear ac magnetic susceptibility on chemically synthesized (Nd0.7?xGdx)Sr0.3MnO3 show various interesting features with doping level x = 0.3. A ...

The effect of the doping of rare earth Gd(3+) ions replacing Nd(3+) in Nd(0.7)Sr(0.3)MnO(3) is investigated in detail. Measurements of resistivity, magnetoresistance, magnetization, and linear and nonlinear ac magnetic susceptibility on chemically synthesized (Nd(0.7-x)Gd(x))Sr(0.3)MnO(3) show various interesting features with doping ...

The complex susceptibility was measured on CoFe2O4 nanoparticle suspensions in the frequency range between 1 kHz and 1 MHz for different values of a superimposed static magnetic field. The maximum in the imaginary part ?'' of the ac susceptibility shifts to higher frequencies with increasing static magnetic field. ...

Exchange anisotropy in Co/CoO bilayers has been studied using electrical transport to probe the magnetization. The Ta(5nm)/Co(l00nm) samples were grown on single crystal CoO(l00) and CoO(111) oriented substrates by do magnetron sputtering. The measurements include both the AMR and the planar Hall effect by simultaneously applying a do and a perpendicular ...

AC magneitic susceptibilities measured between 1 and 4.2 K are reported for a series of rare earth bromate hydrates, RE(BrO3)3 � 9H2O, for the rare earths Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, and Yb. Results for Pr, Tb, Dy, and Er are in good agreement with a previous determination. New results are reported for Nd, Sm, Gd, Ho, and Yb, ...

AC magneitic susceptibilities measured between 1 and 4.2 K are reported for a series of rare earth bromate hydrates, RE(BrO/sub 3/)/sub 3/ x 9H/sub 2/O, for the rare earths Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, and Yb. Results for Pr, Tb, Dy, and Er are in good agreement with a previous determination. New results are reported for Nd, Sm, Gd, ...

Static spin polarization of Fe moments in a spin glass AuFe, determined by zero-field ..mu..SR, is compared to an ac-susceptibility measurement below the cusp temperature T/sub g/, and a rather uniform amplitude of the static polarization is pointed out for frozen spins. Completely random orientation of frozen spins is revealed by neutron scattering in a ...

In this paper we explore the possibilities given by the ac-susceptibility ?(?), to gain information about the dynamical response of a system in the critical region. Sr3Ru2O7 is known to be a strongly correlated metal with an itinerant metamagnetic first order transition, that can also be associated with a new type of quantum critical point. We study the ?(?) of this system and ...

Results of ac magnetic susceptibility measurements performed on the trigonal prismatic complex U(Ph(2)BPz(2))(3) demonstrate the presence of slow magnetic relaxation under zero applied dc field. Analysis of both the temperature and frequency dependence of the ac susceptibility indicate a ...

Coupling of the charge carriers through the magnetic spin susceptibility which is strongly peaked at ({pi}, {pi}) in the two dimensional CuO{sub 2} Brillouin zone leads to strong momentum anisotropies and energy dependencies in the inelastic optical scattering rates. The a.c. conductivity is isotropic and can be used to extract an effective, isotropic ...

Commensurability effects between the superconducting flux-line lattice and a square lattice (period d=1thinsp{mu}m) of submicron holes (diameter D=0.4thinsp{mu}m) in 1500 {Angstrom} vanadium films were studied by atomic-force microscopy, dc magnetization, ac susceptibility, magnetoresistivity, and I-V measurements. Peaks in the ...

We have investigated the ac magnetic susceptibility and magnetic heating of aqueous suspensions of ?-Fe2O3 nanoparticles embedded in alginate hydrogel matrix and isolated ?-Fe2O3 and Fe3O4 nanoparticles coated with tetramethyl ammonium hydroxide. All three ferrofluids were characterized by measuring the dc magnetization, ...

The DyTiFe(sub 11-x)Co(sub x) (x = 0, 1, 3), HoTiFe(sub 11-x)co(sub x) (x = 0, 3) and ErTiFe(sub 11) compounds, all exhibiting the ThMn(sub 12)-type structure, were studied for their ac susceptibility in the temperature range 20-300 K. The Dy- and Ho-cont...

ac-susceptibility ([chi][prime],[chi][prime][prime]) measurements as a function of temperature and ac field amplitude have been carried out on cylindrical samples of the 110-K phase of the Bi-Sr-Ca-Cu-O system. The two single-phase samples used for studies were prepared under different experimental conditions with an aim to understand ...

Changes in the physical properties of Pb-doped and Pb-Sn doped polycrystalline Bi-2223 high temperature super-conductors irradiated by 100MeV O7+ were studied. All the samples irradiated were prepared by usual solid state reactions. The parent compound was single phase with a Tc(0) value of 106K for the Pb-doped batch and 107K for the Pb-Sn batch. The samples were irradiated at various fluences in ...

We compare vortex pinning properties of high temperature superconductors (HTS) thin films and correlate these to microstructure to identify pinning centres. We have grown YBa2Cu3O7- (YBCO), YBCO/PrBa2Cu2.8Ga0.2O7-? (YBCO/PBCGO), NdBa2Cu3O7-? (NBCO) thin films and superlattices on (100) SrTiO3. We show that pinning by intersections of twin boundaries usually dominates except for strained ...

Systematic dc and ac magnetic susceptibility measurements performed on RuSr2Eu1.5Ce0.5Cu2O10-? (Ru1222) demonstrate a paramagnetic to ferromagnetic transition around 95 K. The third harmonic of the ac susceptibility reveals that the system undergoes a spin glass transition below 75 K. The ...

An ac inductance bridge for the measurement of low temperatures is described. Instead of a resistive divider, an inductive voltage divider was used in the bridge. Good noise immunity of the system, a low noise value of 0.5 nV, the resolution of 4 x 10/sup -6/, and the comparison accuracy of 2 x 10/sup -5/ have been obtained. The described ...

... In general, all low alloy martensitic steels showed a susceptibility to stress corrosion failure in varying degree, D6Ac being the least susceptible and ...

Ni-W alloys are used as the substrate in the manufacture of HTS tape via the RABiTSTM process. Theoretical work has shown that the ferromagnetism in a substrate can affect the ac losses in the superconductor. This occurs in part because of the increased magnetic permeability, which alters the magnetic induction in the superconductor and thereby the loss. Magnetic hysteretic ...

... Title : THE USE OF AC FIELD MEASUREMENTS TO DETERMINE THE SHAPE AND SIZE OF A CRACK IN A METAL. Corporate Author : ...

... MAGNETIC SENSOR FOR A DIRECT MEASUREMENT OF THE AC INITIAL PERMEABILITY OF FULL WAFER SOFT MAGNETIC FILMS (UP TO ...

... Title : Measurement of Low Corrosion Rates: Comparison of ac Impedance and Thin Layer Activation Methods,. Corporate Author : ...

Colorectal cancer (CRC) is a multistep disease that involves a two-way interaction between a complex genetic pre-disposition component, and a set of poorly understood extrinsic environmental factors. In mice, CRC can be induced by treatment with azoxymethane (AOM). Using a set of AcB/BcA recombinant congenic strains derived from CRC-susceptible A/J and ...

We report DC magnetization, detailed systematic linear and nonlinear AC magnetic susceptibility and transport for a single phase RuSr2Eu1.4Ce0.6Cu2O10-? (EuRu-1222) magneto-superconductor. The studied sample is synthesized through standard solid state reaction route, which is crystallized in single phase tetragonal structure with space group I4/mmm. DC ...

The results of electrical transport and AC susceptibility measurements performed with the goal of studying the superconducting and normal state electrical properties of polycrystalline samples of YBa[sub 2]Cu[sub 3]O[sub 7[minus][delta

High-resolution neutron powder diffraction experiments and ac magnetic susceptibility measurements have been performed on La(sub 2-x)Ba(sub x)CuO(sub 4) (x-0.125) at ambient pressure and under high pressures. Crystal parameters including bond lengths and ...

The spatial (within-sample) uniformity of superconducting behavior and microstructure in YBa2Cu3O(7-x) specimens over the pore fraction range of 0.10 to 0.25 was examined. The viability of using a room-temperature, nondestructive characterization method (...

A method of using the ac Josephson current between two superconducting electrodes to probe the spin fluctuations of a magnetic insulating barrier of a junction is suggested. The dc I-V characteristic of such a junction measured as a function of both the dc bias voltage V and the magnitude of a magnetic field parallel to the plane of the junction is ...

DMSA-coated magnetic nanoparticles have been used for drug delivery, in particular to transport cytokines towards an induced tumour in a murine model. In this work, the use of transmission electron microscopy and AC magnetic susceptibility measurements of the tissue have allowed the detection of the particles within the target tissue.

The compound CeOs sub 2 has been prepared in both cubic C15 and hexagonal C14 Laves phases. Measurements of ac and dc magnetic susceptibility, electrical resistivity, and specific heat have been performed on samples of both phases. The C14 phase has been ...

The thermodynamic critical fields of zinc, cadmium, and molybdenum were measured down to 25 mK using an ac susceptibility method. Considerable downward shifts of the deviation function were found for Zn and Cd and analyzed in terms of anisotropic Eliashberg theory with large electron-phonon coupling anisotropy parameters. In contrast ...

An organometallic single-ion magnet is synthesized with only 19 non-hydrogen atoms featuring an erbium ion sandwiched by two different aromatic ligands. This molecule displays a butterfly-shaped hysteresis loop at 1.8 K up to even 5 K. Alternating-current (ac) susceptibility measurement reveals the existence of two thermally activated ...

We compare the irreversibility lines deduced from ac susceptibility measurements on Y-123, Bi- and Hg compounds obtained by various techniques (sintering, zone melting, magnetic field texturing). Field and frequency dependences are studied. Including results from the literature, our analysis indicate that fabrication methods containing ...

The temperature dependence of the harmonics ((chi)n) of the ac magnetic susceptibility in HTS have been investigated by numerical solutions of the non linear diffusion equation for the magnetic flux. Within the framework of the collective pinning model, t...

... the Pink Bollworm1 Susceptibility to the Bacillus thuringiensis Endotoxins Cry1Ac and Cry2Ab in MéxicoMonitoreo de la Susceptibilidad ... delay the development of pest resistance to Bt endotoxins (Benedic...

Priorities for conservation, management, and associated activities will differ based on the interplay between nearness of ecosystems to full recovery from a disturbance (pristineness), susceptibility to climate change (environmental susceptibility [ES]), and capacity of human communities to cope with and adapt to change (social adaptive capacity ...

Samples will be characterized by structural and chemical analysis, DC resistance and magnetoresistance versus temperature, and AC magnetic susceptibility, ...

... LEAD ALLOYS, TIN ALLOYS, CRYOGENICS, ALTERNATING CURRENT, SOLID SOLUTIONS, IMPURITIES, BISMUTH ALLOYS, INDIUM ALLOYS. ...

Soft magnetic Co and Fe films were deposited by pulsed laser ablation on Cu wires. The circular magnetic susceptibility of the cylindrical films was measured by applying an ac circular magnetic field at frequencies up to 6 GHz. The measured ferromagnetic resonance frequency of the Co films was 2.5 GHz, and the real ...

The main purpose of this work was to design, develop and construct a simple, low-cost ac susceptometer to measure large, bulk superconducting samples (up to 32 mm in diameter) in the temperature range 78-120 K. The design incorporates a double heating system that enables a high heating rate (25 K h-1) while maintaining a small temperature gradient (<0.2 ...

We report the synthesis and structural and physical properties of CaFe4As3 single crystals. Needle-like single crystals of CaFe4As3 were grown out of Sn flux and the compound adopted an orthorhombic structure as determined by x-ray diffraction measurements. Electrical, magnetic, and thermal properties indicate that the system undergoes two successive phase transitions, ...

Measurements of a-c susceptibility were made on niobium wire. It was inferred from results that the individual domain walls do not move in response to the a-c measuring field. At 4 deg the sample appeared perfectly diamagnetic up to about 9 kgauss. The energy gap in niobium was ...

The effect of weak dipolar interactions (DIs) between Ni nanoparticles (NPs) in samples with different Ni concentrations was investigated by performing a detailed characterization of their structural and magnetic properties. From the determination of several physical parameters of Ni NP assemblies, it was found that the ac and dc magnetic susceptibility ...

We present a novel detection scheme for magnetic nano and micro particles using a magnetic force microscope (MFM) that allows for the local measurement of AC magnetic susceptibility. The method makes use of the nonlinearities in the magnetic response of a particle that come from its intrinsic magnetic ...

We have used temperature- and frequency-resolved ac-susceptibility measurements to investigate the magnetic relaxation of a Co0.2Fe2.8O4 magnetic fluid above the freezing point of the liquid carrier. Our data show that both the N�el and the Brown relaxation mechanisms are operative at temperatures in the vicinity of the out-of-phase (imaginary) ...

The magnetic properties of the nanocomposite consisting of hematite (?-Fe2O3) nanoparticles embedded in the hollows of the periodic nanoporous silica matrix were investigated. The magnetic measurements showed on the superparamagnetic behavior of the nanoparticles. This behavior was evidenced by the irreversibility of magnetization curves measured in ...

Doping of the band insulator FeS2 with Co on the Fe site introduces a small density of itinerant carriers and magnetic moments. The lattice constant, ac and dc magnetic susceptibility, magnetization, and specific heat have been measured over the 0?x?0.085 range of Co concentration. The variation in the ac ...

The frequency dependent low-field circular ac susceptibility ?=?'-j?'' of a nearly nonmagnetostrictive Co68.2Fe4.3Si12.5B15 amorphous wire annealed at 470 �C is determined by impedance Z measurements under stepwise decreased longitudinal dc field Hdc from 216 to -216 A/m after premagnetization at 16 kA/m. It is found that compared ...

The onset of correlation effects in the magnetic Ho^3+-subsystem in LiHoxY1-xF4 single crystals is studied by comparing measurements and simulations of the field and frequency dependent magnetic AC susceptibility at 1.8 K and field and temperature dependent muon depolarization rates (?SR) for the concentrations x=0.0017, 0.0085, 0.041 ...

BACKGROUND: Acute coronary syndrome (ACS) is one of the most common forms of heart disease. Recent studies have shown that interleukin (IL)-8 plays a key role in the development of atherosclerotic plaques, but the relationship between the common genetic variants of IL-8 and ACS has not been extensively studied. METHODS: This case-control study in the ...

We investigated that in HgBa2Can-1CunO2n+2+? [Hg-12(n-1)n], for n ? 6, Tc of about 105 K, vortex melting lines remains constant and independent of number of inner plane CuO2 layers. However the vortex dynamics of the supermultilayer system could be crucially different from that of single or double layer cuprates. Therefore we measured the fundamental and third harmonic ...

A new measurement system has been developed for detecting frequency dependence of low-field alternating current (AC) magnetic susceptibility in natural samples. Instead of employing intricate AC bridge circuits, this system configuration is simple and consists of a set of primary, secondary (pick-up), and ...

A new measurement system has been developed for detecting frequency dependence of low-field alternating current (AC) magnetic susceptibility in natural samples. Instead of employing intricate AC bridge circuits, this system configuration is simple and consists of a set of primary, secondary (pickup), and ...

... of a specimen with crack extension, utilize either a dc or, more recently, an ac measurement system. The dc and ac systems are described, and the ...

A systematic ac magnetic susceptibility, ?ac(T) , study has been performed on several R2Fe14BHx ( R=rare earth) compounds in order to determine the origin of the anomalous behavior of ?ac(T) not related to spin reorientation transitions�the so-called non-SRT anomalies. All the measurements ...

In order to examine magnetic properties of a spin-glass Mn{sub 0.55}Mg{sub 0.45}TiO{sub 3} under magnetic fields, dc magnetization, ac susceptibility, muon spin relaxation ({mu}SR), and neutron scattering measurements have been performed. A freezing temperature observed by the dc magnetization and the ac ...

Measurements of temperature dependence of AC-susceptibility were made in Fe-30.2at.%Ni Invar alloy before and after 100 MeV Xe ion irradiation up to the dose of 1014 ions/cm2. Measurements were performed at various angles /? between the direction of the ion beam and the external AC-magnetic field. It was found that ...

Resistivity and low field ac susceptibility measurements are made on R: 123 superconducting samples with different rare earth elements R. The order parameter dimensionality OPD is deduced from resistivity versus temperature plot using the Aslamazov and Larkin expression, while the analysis of the temperature dependence of ...

... OF AC FLUX LEAKAGE, EDDY CURRENT, EMAT AND ULTRASONIC METHODS OF MEASURING SURFACE CONNECTING FLAWS IN ...

... Assisted DC and AC Techniques in Electrochemical ... data acquisition and calculation method, allows the ... Impedance measurements give the same ...

... Accession Number : ADD404791. Title : AC technique offers quantum advantage in operation of appearance measuring instruments. ...

Measurements of the electrical resistivity of palladium, residual resistivity ratio approx. 22 500, containing 1.7 ppm of Fe have been made from 5.5 K to 1.8 mK. 15 Hz ac susceptibility measurements from 1 K to 1.8 mK together with the resistivity data suggest that a transition into a spin-glass state occurs near 7 ...

In order to resolve the controversy over the low-temperature magnetic phase of UCu2Ge2 ac susceptibility, neutron-depolarization and neutron-diffraction measurements have been carried out on a well-annealed polycrystalline sample. Our measurements reveal that UCu2Ge2 remains ferromagnetic at all temperatures below ...

AC susceptibility and DC magnetization measurements were performed to examine the effect of P substitution on the superconducting and critical properties of optimally doped PrOFe0.9Co0.1As superconductor. Although P substitution increases the superconducting phase fraction, the TC of the compound is found to decrease at a rate of ~13 ...

Tm2Fe3Si5 is known to undergo a transition to the superconducting state (at ambient or applied pressure depending on the sample) at a temperature Tc1(~1.8 K), and at a lower temperature TN(?1 K) it undergoes a transition into a long range antiferromagnetically ordered state. Superconductivity is simultaneously destroyed and the sample re-enters the normal state at Tc2 = TN. The conditions reported ...

BACKGROUND: Cassava cultivars are classified following different criteria, such as cyanogenic glucoside content or starch content. Here, flours from the roots of 25 cassava varieties cultivated simultaneously in a single plantation, were characterized in terms of starch content (SC), amylose content (AC), ?-amylolysis index (AI) and gel formation ability. Resistant starch ...

The magnetic susceptibility of single crystals of Mn12-ac obeys a Curie-Weiss law, indicating a transition to a ferromagnetic phase below 1 K [1]. Measurements by Hall magnetometry have yielded different temperature intercepts ranging from 0.4 K to 0.9 K. Moreover, these values differ from those obtained for the same crystals in a ...

The preparation and properties of 120-K Tl-based high-temperature superconducting thin films on LaAlO3 substrates are reported. These films are obtained by postannealing 2Tl: 2Ca: 2Ba: 3Cu: 10O precursor films at about 890 C in a sealed quartz tube filled with about 1-atm O2. Results of ac susceptibility measurements show a sharp drop ...

Zero-field muon-spin relaxation has been measured in CuMn spin-glasses (5 at. % and 3 at. %) using the surface muon beam. Dynamic correlation time and static spin polarization of Mn moments, determined at 0.1T/sub g/approx.3T/sub g/, are consistent with neutron-spin-echo and ac-susceptibility measurements on the same specimens reported ...

Complex ac susceptibility measurements are reported on composite Au-Fe3O4 nanoparticles of two different configurations-the so-called ``dumbbell'' and ``flower'' configurations. The frequency-dependent blocking temperature was fitted to two separate models in an attempt to understand the relaxation and the role of interactions present ...

Nickel zinc ferrite nanoparticles NixZn1?xFe2O4 (x=0.1, 0.3, 0.5) have been synthesized by a chemical co-precipitation method. The samples were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, electron paramagnetic resonance, dc magnetization and ac susceptibility measurements. The X-ray diffraction patterns ...

Nickel zinc ferrite nanoparticles of the composition NixZn1-xFe2O4 (x = 0.1, 0.3, 0.5) have been synthesized by the chemical co-precipitation method. The samples were characterized by X-ray diffraction, TEM, EPR, DC magnetization and AC susceptibility measurements. The X-ray diffraction patterns confirm the synthesis of single ...

Concentrated spin-glass behavior is discovered in a mechanically milled crystalline compound GdN. We report on measurements of magnetic relaxation and both ac and dc magnetic susceptibility at temperatures between 2 and 300 K in a magnetic field up to 5 T. Both ac and dc magnetic susceptibility ...

We present single crystal AC-susceptibility and magnetisation measurements of R2PdSi3 compounds with R=Tb, Dy, Ho, Er, and Tm. The crystal-electric field (CEF) parameter B20 and the value of the two-ion interaction exchange integral J(Q=0) are evaluated from the anisotropy of the AC-susceptibility measurements in ...

Two novel tetranuclear, star-shaped iron(III) clusters, [Fe(4)(acac)(6)(Br-mp)(2)] and [Fe(III) (4)(acac)(6)(tmp)(2)], are described. Both have S=5 ground states resulting from antiferromagnetic nearest-neighbour superexchange interactions, with J=-8.2 cm(-1) and J=-8.5 cm(-1) for 1 and 2, respectively. Energy barriers for the relaxation of the magnetisation of approximately 12 cm(-1) were derived ...

We have performed ac susceptibility and dc magnetization measurements in Ni(50-x)Co(x)Mn(38)Sb(12) Heusler alloys. From the ac susceptibility measurements, the existence of reentrant spin glass (RSG) state is observed for x�=�0-5. It is found that the signature of RSG ...

Low-field ac susceptibility was measured on bulk La0.7Ca0.3MnO3 prepared by a partial melting technique. Discontinuous jumps with heights of (1-2)�10-5 emu at temperature intervals of 3-5 K were observed in the ac susceptibility. 28 jumps were observed in the temperature range between 4.2 K ...

Recent improvements in the vibrating reed (VR) technique permit high precision studies of the nonlinear, anisotropic magnetic susceptibility of bulk and thin-film materials (L. De Long et al., Physica B 223&224 (1996) 22). Several advantages of the basic technique, with special attention to drive and frequency ranges, will be described in comparison to DC magnetometry and ...