Journal of Magnetism and Magnetic Materials

Items from 1 to 12 out of 12 results

article

The effect of pressure and magnetic field on the O–R structural phase transition in La1−xSrxMnO3 single crystals: the transition heat

E.A. Neifeld, N.G. Bebenin, V.E. Arkhipov, K.M. Demchuk, more

Journal of Magnetism and Magnetic Materials > 2005 > 295 > 1 > 77-81

We study the effect of pressure and a magnetic field on the temperature T _S of the structural transition from orthorhombic to rhombohedral phase in La ₁₋ _x Sr _x MnO ₃ single crystals. The temperature dependence of the phase volumes and the jumps in saturation magnetization (x=0.20 and 0.175) or magnetic susceptibility in paramagnetic state (x=0.15) have been measured...

article

Localized magnetic excitations of coupled impurities in a transverse Ising ferromagnet

R.V. Leite, J. Milton Pereira, R.N. Costa Filho

Journal of Magnetism and Magnetic Materials > 2005 > 295 > 1 > 57-64

A Green's function formalism is used to calculate the spectrum of excitations of two neighboring impurities implanted in a semi-infinite ferromagnetic. The equations of motion for the Green's functions are determined in the framework of the Ising model in a transverse field and results are given for the effect of the exchange coupling, position and orientation of the impurities on the spectra of localized...

article

Effect of Ni doping on the properties of fine magnetite particles

M. Mohapatra, Brajesh Pandey, Chandan Upadhyay, S. Anand, more

Journal of Magnetism and Magnetic Materials > 2005 > 295 > 1 > 44-50

Vibrating sample magnetometer (VSM) and Mössbauer spectroscopy are used to characterize the magnetic behaviour of fine magnetite particles obtained from (i) pure goethite and (ii) Ni-doped goethite, in ammoniacal solution. The latter sample has 0.4wt% Ni which has significantly changed the properties of the sample. The Ni-doped magnetite shows a much higher overoccupancy of tetrahedral sites by iron...

article

Study of the influence of surface anisotropy and lattice structure on the behaviour of a small magnetic cluster

Laura Hernández, Claire Pinettes

Journal of Magnetism and Magnetic Materials > 2005 > 295 > 1 > 82-94

We have studied by Monte Carlo simulations the thermal behaviour of a small (N=13 particles) cluster described by a Heisenberg model, including nearest-neighbour ferromagnetic interactions and radial surface anisotropy, in an applied magnetic field. We have studied three different lattice structures: hexagonal close packed, face centered cubic and icosahedral. We show that the zero-field thermal behaviour...

article

Spontaneous magnetostriction in R2Fe14B (R=Y, Nd, Gd, Tb, Er)

N. Yang, K.W. Dennis, R.W. McCallum, M.J. Kramer, more

Journal of Magnetism and Magnetic Materials > 2005 > 295 > 1 > 65-76

Thermal expansion anomalies of R ₂ Fe ₁₄ B (R=Y, Nd, Gd, Tb, Er) stoichiometric compounds were studied by X-ray diffraction with high-energy synchrotron radiation using a Debye–Scherrer geometry in temperature range of ∼10–1000K. A large invar effect with a corresponding large temperature dependence of lattice parameters ∼10–15K above their Curie temperatures (T _c ) are observed...

article

Microstructures and magnetic domain structures in Sm2(Fe,Mn)17Nδ powders studied by analytical electron microscopy and Lorentz microscopy

A. Yasuhara, H.S. Park, D. Shindo, T. Iseki, more

Journal of Magnetism and Magnetic Materials > 2005 > 295 > 1 > 1-6

Microstructures and magnetic domain structures of Sm ₂ (Fe,Mn) ₁₇ N _δ (δ=0, 3.4, 4.2, 5.0) powders are investigated by analytical electron microscopy and Lorentz microscopy, respectively. It is found that amorphous phases form with the addition of nitrogen and the area of the amorphous phases increases with the increase in nitrogen content. By elemental mapping with electron...

article

Synthesis and characterization of tat-mediated O-CMC magnetic nanoparticles having anticancer function

Aijie Zhao, Peng Yao, Chunshang Kang, Xubo Yuan, more

Journal of Magnetism and Magnetic Materials > 2005 > 295 > 1 > 37-43

This paper describes a new formulation of magnetic nanoparticles coated by a novel polymer matrix—O-carboxylmethylated chitosan (O-CMC) as drug/gene carrier. The O-CMC magnetic nanoparticles were derivatized with a peptide sequence from the HIV-tat protein to improve the translocational property and cellar uptake of the nanoparticles. To evaluate the O-MNPs-tat as drug carriers, MTX was incorporated...

article

Editorial board

Journal of Magnetism and Magnetic Materials > 2005 > 295 > 1 > v-vii

article

Spectral, initial magnetic permeability and transport studies of Li0.5−0.5xCoxFe2.5−0.5xO4 spinel ferrite

A.M. Abo El Ata, S.M. Attia, D. El Kony, A.H. Al-Hammadi

Journal of Magnetism and Magnetic Materials > 2005 > 295 > 1 > 28-36

A series of polycrystalline spinel ferrite with composition Li _0.5−0.5 _x Co _x Fe _2.5−0.5 _x O ₄ where (x=0.0, 0.2, 0.4, 0.6, 0.8, 1) were prepared by the well-known double sintering process to investigate their spectral, initial magnetic permeability and transport properties. The X-ray diffraction analysis showed that all samples have single cubic spinel phase...

article

Magnetic properties of Ba–Nd–Co system M-type ferrite fine particles prepared by controlling the chemical coprecipitation method

H. Yamamoto, M. Isono, T. Kobayashi

Journal of Magnetism and Magnetic Materials > 2005 > 295 > 1 > 51-56

Single phase Ba–Nd–Co M-type ferrite fine particles were prepared by the chemical coprecipitation method and subsequent heat treatment method. Optimum magnetic properties were achieved with materials of composition Ba ²⁺ _0.99 Nd ³⁺ _0.118 Co ²⁺ _0.041 Fe ³⁺ _11.86 O ²⁻ ₁₉ and heat treatment of 1000°C×2h in air. The magnetic and physical properties...

article

Microstructure and magnetic properties of non-stoichiometric M-type hexaferrite with barium surplus

Wen-Yu Zhao, Qing-Jie Zhang, Li-Chun Li, Jian-Guo Guan

Journal of Magnetism and Magnetic Materials > 2005 > 295 > 1 > 21-27

In this paper we present a modified coprecipitation method to obtain single-phase non-stoichiometric M-type hexaferrite with barium surplus Ba ₁₊ _x CoTiFe ₁₀ O ₁₉₊ _x (x=0.00, 0.05, 0.10, 0.15, 0.20). X-ray analysis confirmed that the crystal structure of Ba ₁₊ _x CoTiFe ₁₀ O ₁₉₊ _x did not collapse as the x increased in the range 0–0.20...

article

Nanoscale microstructure and magnetic properties of melt-spun Sm(Co0.725Fe0.1Cu0.12Zr0.04B0.015)7.4 ribbons

R. Gopalan, X.Y. Xiong, T. Ohkubo, K. Hono

Journal of Magnetism and Magnetic Materials > 2005 > 295 > 1 > 7-20

We have investigated the nanocrystalline microstructure and the hard magnetic properties of Sm(Co _0.725 Fe _0.1 Cu _0.12 Zr _0.04 B _0.015 ) _7.4 melt-spun ribbons. The coercivity (Hc) of the as-spun ribbons increased with the wheel surface speed from 2.8kOe for 10m/s to 14.5kOe for 40m/s. The post-annealing of the melt-spun ribbons from 700 to 900°C for...

Filter options

Number:
1
Volume:
295
Year:
2005

Publication date

Set your own date range

Keywords

MAGNETIC PROPERTIES (3)
MICROSTRUCTURE (2)
BA–ND–CO M-TYPE FERRITE (1)
CARRIER (1)
CHEMICAL COPRECIPITATION (1)
COERCIVITY (1)
COERCIVITY MECHANISM (1)
CYTOTOXICITY (1)
DOMAIN WALL PINNING (1)
EELS ELEMENTAL MAPPING (1)
FINE PARTICLES (1)
GREEN'S FUNCTION (1)
HEAT TREATMENT (1)
HEISENBERG FERROMAGNET (1)
IMPURITIES MODES (1)
IR SPECTROSCOPY (1)
ISING MODEL TRANSVERSE (1)
LORENTZ MICROSCOPY (1)
M-TYPE HEXAFERRITE WITH BARIUM SURPLUS (1)
MAGNETIC PERMEABILITY (1)
MAGNETITE (1)
MAGNETOSTRICTION (1)
MANGANITES (1)
MELT-SPINNING (1)
MONTE CARLO SIMULATIONS (1)
MÖSSBAUER SPECTROSCOPY (1)
NANOCRYSTALLINE MATERIALS (1)
NANOPARTICLES (1)
NI-DOPING (1)
O-CARBOXYLMETHYLATED CHITOSAN (1)
PEPTIDE (1)
POLYMER (1)
RARE-EARTH TRANSITION-METAL COMPOUND (1)
REDUCTION AND DIFFUSION METHOD (1)
RIETVELD REFINEMENT (1)
SMALL MAGNETIC CLUSTERS (1)
SPIN WAVE (1)
SPINEL FERRITE (1)
STRUCTURAL TRANSITION (1)
SURFACE ANISOTROPY (1)
SYNCHROTRON (1)
TEM (1)
THERMOELECTRIC POWER AND DC CONDUCTIVITY (1)
THREE-DIMENSIONAL ATOM PROBE (1)
TRANSITION HEAT (1)
TUMOR (1)
X-RAY DIFFRACTION ANALYSIS (1)
X-RAY POWDER DIFFRACTION (1)
more

INFONA - science communication portal

Journal of Magnetism and Magnetic Materials

Add recipient

Sending message cancelled

Are you sure you want to cancel sending this message?

Send message

Filter options

Publication date

Date range setting

Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.

Keywords

Reporting an error / abuse

Sending the report failed

Accessibility options