Journal of Magnetism and Magnetic Materials

Items from 1 to 20 out of 27,536 results

article

The temperature dependence of the optical anisotropy in magnetic fluids: Birefringence and dichroism

N.A. Yusuf, D.A. Manasrah, M.A. Abdallah, H. Abu-Safia, more

Journal of Magnetism and Magnetic Materials > 1994 > 138 > 1-2 > 173-188

The temperature dependence of birefringence, δ, and dichroism, ΔA, in Fe ₃ O ₄ Isopar-M based magnetic fluids have been investigated in the temperature range 100 < T < 320 K and in magnetic fields up to 3 kOe. The results show that birefringence and dichroism for a given concentration and at a given field are zero below a certain temperature T _s , and then both increase...

article

Influence of grain boundaries on complex permeability in MnZn ferrites

J. Pankert

Journal of Magnetism and Magnetic Materials > 1994 > 138 > 1-2 > 45-51

The permeability of ceramic soft magnetic ferrites distinctly depends on grain size. A model will be presented which accounts for this dependency in a quantitative fashion and without any adjustable parameter. This model involves boundary conditions for the spin system at the exchange-decoupled interfaces of adjacent grains and an inhomogeneous free energy density which brings the domain wall width...

article

Structural and dc electrical resistivity study of Gd ³ ⁺ -substituted Cu-Cd mixed ferrites

C.B. Kolekar, A.S. Vaingankar, P.N. Kamble

Journal of Magnetism and Magnetic Materials > 1994 > 138 > 1-2 > 211-215

Polycrystalline ferrite compositions of Cd _x Cu ₁ _- _x Fe ₂ _- _y Gd _y O ₄ (x = 0.0, 0.2, 0.4, 0.6, 0.8, and 1.0; y = 0.0 and 0.1) were prepared by the standard ceramic technique. The X-ray crystallographic study was done using filtered Cu K α radiation. From the diffractograms it is observed that for x 0.2 compounds are cubic spinels, while...

article

Influence of uniaxial compressive stresses on magnetic properties across an Fe ₇ ₉ _. ₁ Cr ₄ _. ₃ B ₁ ₆ _. ₆ amorphous ferromagetic ribbon

A. Lovas, P. Kollár, F. Gamčík, É. Kisdi-Koszó, more

Journal of Magnetism and Magnetic Materials > 1994 > 138 > 1-2 > 105-108

The influence of uniaxial compressive stresses on the energy of magnetoelastic anisotropy of an amorphous ferromagnetic alloy with composition Fe ₇ ₉ _. ₁ Cr ₄ _. ₃ B ₁ ₆ _. ₆ has been investigated. Uniaxial pressure within a part of the sample cross-section was obtained by straightening out the ribbon annealed in a toroidal shape. The bulk value...

article

Superparamagnetic behavior and giant magnetoresistance in as-obtained Co-Ag metastable alloys

F. Conde, A. Hernando, C. Gómez-Polo

Journal of Magnetism and Magnetic Materials > 1994 > 138 > 1-2 > 123-131

The correlation between the structure and the magnetic and magnetotransport properties of metastable alloys Co _x Ag ₁ ₀ ₀ _- _x (14 x 62), obtained by magnetron sputtering, are investigated as function of the Co content, x. The as-obtained samples show superparamagnetic behavior at room temperature for almost all the concentration range, with blocking temperatures...

article

Mossbauer investigations of γ-Fe ₂ O ₃ nanocrystals embedded in polypyrrole

P. Auric, O. Jarjayes

Journal of Magnetism and Magnetic Materials > 1994 > 138 > 1-2 > 115-122

Magnetic and Mossbauer experiments on fine grains of γ-Fe ₂ O ₃ coated with citrate anions and included or not in an electroconducting polymer matrix are combined in order to study superparamagnetic relaxation phenomena. The mean particle diameters calculated from the magnetization curves were found to be very similar for the starting ferrofluid and the polymer. Mossbauer experiments...

article

Magnetic susceptibility of Pr ₂ _- _x Ce _x CuO ₄ monocrystals and polycrystals

H. Ledbetter, Y. Hidaka, M. Földeáki

Journal of Magnetism and Magnetic Materials > 1994 > 138 > 1-2 > 139-146

We measured the temperature dependence of the magnetic susceptibility of Pr ₂ _- _x Ce _x CuO ₄ monocrystals and polycrystals in the composition range x = 0-0.18. For all compositions, the susceptibility curves reveal strong crystal-field effects and are evaluated in terms of Van Vleck's equation for magnetic susceptibility. At temperatures above 100 K, the behavior could...

article

The dilute spin 2 Ising model: Application of a new technique in effective field theory

H. El Mir, M. Saber, J.W. Tucker

Journal of Magnetism and Magnetic Materials > 1994 > 138 > 1-2 > 76-84

A probability distribution method based on the use of Tucker's generalised Van der Waerden identities is used in a theoretical treatment of the quenched diluted spin 2 Ising model. The approach is employed within the framework of the single-site cluster theory based on the use of exact Ising spin identities. The variation of the transition temperature with site dilution is presented, and the critical...

article

Does Curie-Weiss behavior exist in the birefringence and dichroism in magnetic fluids?

I. Abu-Aljarayesh, M.A. Abdallah, D. Manasrah, H. Abu-Safia, more

Journal of Magnetism and Magnetic Materials > 1994 > 138 > 1-2 > 189-198

The Curie-Weiss behavior of the birefringence, δ, and dichroism, ΔA, in magnetic fluids have been investigated. The analysis of our experimental data on both δ and ΔA in Fe ₃ O ₄ particle magnetic fluids in the temperature range 100 < T < 320 K and in magnetic fields up to 3 kOe shows appreciable deviations from Curie-Weiss-type behavior. Moreover, both birefringence and dichroism...

article

Magnetism of synthetic and natural annite mica: Ground state and nature of excitations in an exchange-wise two-dimensional easy-plane ferromagnetic with disorder

D.G. Rancourt, I.A.D. Christie, G. Lamarche, I. Swainson, more

Journal of Magnetism and Magnetic Materials > 1994 > 138 > 1-2 > 31-44

We have studied the magnetism of annite mica (the Fe-end-member layer silicate having ideal structural formula: (K ⁺ )[Fe ₃ ² ⁺ ] (Al ³ ⁺ Si ₃ ⁴ ⁺ ) O ₁ ₀ ² ^- (OH ^- ) ₂ ) using SQUID magnetometry, Mossbauer spectroscopy, and neutron diffraction on well characterized samples of both a synthetic powder and a natural...

article

Local mean field study of two-sublattice frustrated Ising systems

M. Cieplak, T.Q. Hung, M.S. Li

Journal of Magnetism and Magnetic Materials > 1994 > 138 > 1-2 > 153-162

One- and two-sublattice frustrated Ising systems are studied by the local mean field method. Our results for linear and nonlinear susceptibilities suggest that the reentrancy phenomenon is absent in these systems. A decrease of the irreversibility temperature with the field in the magnetically ordered phases of the two-sublattice system is found to be weaker than in the one-sublattice case. The field-cooled...

article

Magnetic domain wall depinning in a disordered medium

Y. Enomoto

Journal of Magnetism and Magnetic Materials > 1994 > 138 > 1-2 > l1-l5

We numerically study the dynamics of a driven magnetic domain wall through a disordered medium, which is modeled as a random field disorder. The domain wall is driven by an external force and is fluctuated by the disorder and the thermal noise. In particular, we focus on some scaling exponents characterizing the depinning behavior at zero temperature. Performing large scale simulations, we obtain...

article

The diffusion of nitrogen into Nb-modified Sm ₂ Fe ₁ ₇ powder

D.S. Edgley, A.E. Platts, I.R. Harris, B. Saje

Journal of Magnetism and Magnetic Materials > 1994 > 138 > 1-2 > 6-14

Niobium-modified Sm ₂ Fe ₁ ₇ powders were nitrided in pure nitrogen for a range of times and investigated using thermomagnetic analysis, scanning electron microscopy, optical microscopy and electron probe microanalysis (EPMA). Thermomagnetic analysis showed that, on nitriding the Curie point of the core increases continually until the whole particle has been uniformly nitrided...

article

On the annealing of magnetic relaxation processes in magnetite at high temperatures - II: Analysis in the 400 < T(K) < 600 range

J. Castro, D. Martinez, J. Rivas, H.J. Blythe

Journal of Magnetism and Magnetic Materials > 1994 > 138 > 1-2 > 199-206

Magnetic relaxation measurements were performed on vacancy-doped polycrystalline magnetite in the temperature range 200-800 K. Important relaxation processes have been observed in the temperature intervals 250 < T(K) < 350 (peak III) and 400 < T(K)< 600 (peak I). From a detailed analysis of its annealing behaviour, it has been concluded that the main experimental features of peak I are...

article

Local magnetic properties and electronic structure of γ -Fe ₄ N

C. Paduani, J.C. Krause

Journal of Magnetism and Magnetic Materials > 1994 > 138 > 1-2 > 109-114

The first-principles discrete variational method in the self-consistent charge approximation (DVM-SCC) is used to investigate the electronic structure of the ferromagnetic compound γ -Fe ₄ N (fcc). We calculated the hyperfine fields (HF), isomer shifts (IS), magnetic moments and local density of states (DOS) at both non-equivalent iron sites in this phase. We also investigated the dependence...

article

Magnetization and Mossbauer effect study of the pseudo-binary system (Ti ₁ _- _x Nb _x )Fe ₂

M. McElfresh, C.A. Samudio Peres, E. Galvão da Silva

Journal of Magnetism and Magnetic Materials > 1994 > 138 > 1-2 > 63-75

Mossbauer spectroscopy, magnetization and X-ray diffraction measurements have been done on (Ti ₁ _- _x Nb _x )Fe ₂ compounds in order to investigate the effect of Nb on the magnetic properties of TiFe ₂ . The experimental results show that Nb enters the lattice by filling Ti sites thereby forming a continuous phase over the entire range of Nb concentrations. The...

article

Evaluation of the main contributions to the residual resistivities of Fe-Ni-based metallic glasses

M. Očko, E. Babič

Journal of Magnetism and Magnetic Materials > 1994 > 138 > 1-2 > 132-138

The residual resistivities of ferromagnetic alloys from the Fe _x Ni ₈ ₀ _- _x P ₁ ₄ B ₆ and Fe _x Ni ₈ ₀ _- _x B ₂ ₀ amorphous alloy systems have been explained within the framework of the two-current model. Assuming that the alloys containing more than 20 at% Fe are strong ferromagnets, it has been found that there...

article

Optical and magneto-optical properties of Co-Ti-substituted barium hexaferrite single crystals and thin films produced by laser ablation deposition

R. Atkinson, P. Papakonstantinou, I.W. Salter, R. Gerber

Journal of Magnetism and Magnetic Materials > 1994 > 138 > 1-2 > 222-231

Ellipsometry, reflectance photometry and Kerr polarimetry have been used to determine the optical and magneto-optical properties of bulk single-crystal platelets and thin films of Co-Ti-doped barium hexaferrite. The single crystals were grown by a slow-cooling flux method and the thin films were produced by pulsed laser ablation deposition onto single-crystal Al ₂ O ₃ substrates at...

article

Band filling and magnetic properties of a semiconductor structure with antiferromagnetic layers

V.V. Tugushev, E.A. Zhukovsky

Journal of Magnetism and Magnetic Materials > 1994 > 138 > 1-2 > 99-104

The effective spin-exchange Hamiltonian is obtained for an antiferromagnetic semiconductor layer of the structure formed by interchanging antiferromagnetically ordered and nonmagnetic semiconductor layers in the limit of wide spacer between the magnetic layers. The nearest-neighbour exchange integral obtained by means of perturbation theory based on Anderson's Hamiltonian is shown to be a decreasing...

article

Intersublattice exchange coupling in Gd-Co compounds studied by INS

M. Loewenhaupt, P. Tils, K.H.J. Buschow, R.S. Eccleston

Journal of Magnetism and Magnetic Materials > 1994 > 138 > 1-2 > 52-56

Inelastic neutron scattering (INS) has been used to study the intersublattice interaction in GdCo ₂ , GdCo ₅ , Gd ₂ Co ₁ ₄ B, Gd ₂ Co ₁ ₇ , and GdCo ₁ ₀ V ₂ . Direct values of the molecular fields experienced by the Gd moments in these compounds were obtained from the single transition at low momentum transfer in the INS spectra.

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MAGNETIC PROPERTIES (1,138)
MAGNETIZATION (714)
MAGNETIC ANISOTROPY (644)
MAGNETORESISTANCE (619)
MAGNETIC PROPERTY (531)
COERCIVITY (517)
THIN FILMS (488)
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X-RAY DIFFRACTION (347)
FERROMAGNETIC RESONANCE (341)
SUPERPARAMAGNETISM (321)
ANISOTROPY (317)
ELECTRONIC STRUCTURE (304)
MULTILAYERS (301)
[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 75.30.GW (283)
CURIE TEMPERATURE (282)
MÖSSBAUER SPECTROSCOPY (279)
ANTIFERROMAGNETISM (270)
EXCHANGE BIAS (261)
GIANT MAGNETORESISTANCE (261)
[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 75.70.-I (261)
MANGANITES (258)
MAGNETISM (253)
MAGNETIC SUSCEPTIBILITY (252)
MAGNETIC FLUID (246)
MAGNETIZATION REVERSAL (244)
MAGNETIC NANOPARTICLES (238)
MAGNETITE (236)
NANOPARTICLE (236)
SPECIFIC HEAT (233)
THIN FILM (229)
HYSTERESIS (224)
MANGANITE (221)
[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 75.30.KZ (219)
FERRITE (218)
MAGNETIC STRUCTURE (215)
MAGNETIC FIELD (214)
EXCHANGE COUPLING (212)
MOSSBAUER SPECTROSCOPY (201)
FERRITES (199)
MAGNETIC NANOPARTICLE (194)
PHASE TRANSITION (192)
[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 75.50.EE (189)
SUPERCONDUCTIVITY (183)
FERROFLUID (179)
NMR (178)
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[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 75.60.EJ (174)
MAGNETIC FLUIDS (172)
[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 75.50.BB (172)
[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 75.50.KJ (168)
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[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 75.25.+Z (161)
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SATURATION MAGNETIZATION (155)
MAGNETIC MATERIALS (153)
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NANOCRYSTALLINE MATERIALS (145)
DOMAIN STRUCTURE (143)
MAGNETIC MOMENT (143)
[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 75.70.CN (141)
[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 75.50.GG (140)
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MAGNETIC ORDERING (132)
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RESISTIVITY (131)
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TEXTURE (129)
[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 75.70.AK (129)
EXCHANGE INTERACTION (126)
MONTE CARLO SIMULATION (125)
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[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 75.30.CR (118)
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[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 75.60.-D (113)
FERROFLUIDS (112)
[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 75.80.+Q (111)
[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 76.80.+Y (111)
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Journal of Magnetism and Magnetic Materials

The temperature dependence of the optical anisotropy in magnetic fluids: Birefringence and dichroism

Influence of grain boundaries on complex permeability in MnZn ferrites

Structural and dc electrical resistivity study of Gd ³ ⁺ -substituted Cu-Cd mixed ferrites

Influence of uniaxial compressive stresses on magnetic properties across an Fe ₇ ₉ _. ₁ Cr ₄ _. ₃ B ₁ ₆ _. ₆ amorphous ferromagetic ribbon

Superparamagnetic behavior and giant magnetoresistance in as-obtained Co-Ag metastable alloys

Mossbauer investigations of γ-Fe ₂ O ₃ nanocrystals embedded in polypyrrole

Magnetic susceptibility of Pr ₂ _- _x Ce _x CuO ₄ monocrystals and polycrystals

The dilute spin 2 Ising model: Application of a new technique in effective field theory

Does Curie-Weiss behavior exist in the birefringence and dichroism in magnetic fluids?

Magnetism of synthetic and natural annite mica: Ground state and nature of excitations in an exchange-wise two-dimensional easy-plane ferromagnetic with disorder

Local mean field study of two-sublattice frustrated Ising systems

Magnetic domain wall depinning in a disordered medium

The diffusion of nitrogen into Nb-modified Sm ₂ Fe ₁ ₇ powder

On the annealing of magnetic relaxation processes in magnetite at high temperatures - II: Analysis in the 400 < T(K) < 600 range

Local magnetic properties and electronic structure of γ -Fe ₄ N

Magnetization and Mossbauer effect study of the pseudo-binary system (Ti ₁ _- _x Nb _x )Fe ₂

Evaluation of the main contributions to the residual resistivities of Fe-Ni-based metallic glasses

Optical and magneto-optical properties of Co-Ti-substituted barium hexaferrite single crystals and thin films produced by laser ablation deposition

Band filling and magnetic properties of a semiconductor structure with antiferromagnetic layers

Intersublattice exchange coupling in Gd-Co compounds studied by INS

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