Showing papers in "Journal of Magnetism and Magnetic Materials in 1995"

TL;DR: In this article, a giant magnetoresistance ratio of 30% at 4.2 K and 18% at 300 K was observed for the first time in an Fe/Al2O3/Fe junction.

TL;DR: A review of recent advances in ferrofluid technology both in the conventional and in new market areas is presented in this article, where a number of new applications have emerged such as ferro-fluid steppers, gauges and sensors.

TL;DR: In this article, the effect of citrate ions on the growth of magnetite particles is investigated and the characterisation of the maghemite particles by various techniques (X-ray diffraction, transmission electron microscopy, magnetic measurements) is described.

TL;DR: In this article, a size sorting method performed on ionic magnetic fluids, constituted by polydisperse anionic particles dispersed in water at pH 7, allows "monodisperse" samples to be obtained.

TL;DR: In this article, basic mechanisms of interlayer exchange coupling between two ferromagnets separated by a non-magnetic spacer are surveyed, and three special mechanisms of non-cos θ coupling are described: fluctuations of spacer thickness, loose spins, and a novel phenomenological coupling through a nonnormal spacer.

TL;DR: In this article, a lognormal distribution of number, volume or diameter is considered to be the most appropriate for a treatment of particle size, which is also necessary to ensure that the effects of particle interactions are understood and any analysis takes these into account.

TL;DR: In this article, it was shown that ferritin follows N6el-Arrhenius behavior over eight orders of magnitude in frequency and a preexponential slowdown of 10-Us and an anisotropy energy of Ea/k B = 318 K were obtained.

TL;DR: In this paper, the origin of the spatially modulated spin structure can be explained in terms of the existence of relativistic Lifshitz invariants, by minimizing the free energy of the crystal and taking the lifshitz-invariant invariants into account.

TL;DR: In this paper, the first magnetization measurements of single submicronic particles at very low temperature made of either Ni, Co, CoZrMoNi or TbFe were presented.

TL;DR: A series of alloys with the composition Nd 3 Fe 27.5 y Mo y (0 ≤ y ≤ 1.5) and the Nd3 (Fe,Ti) 29 -type structure have been synthesized as discussed by the authors.

TL;DR: In this paper, the role of the amount of the soft magnetic phase, and the effect of grain shape, realistic three-dimensional grain arrangements have been used to investigate the correlation between the microstructure and the basic magnetic properties of two-phase permanent magnets such as the remanence, the coercive field and the maximum energy product.

TL;DR: In this paper, it was shown that the magnetoresistance ratio is roughly proportional to the product of spin polarizations of both ferromagnets and that the dependence of MR ratio, saturation resistance and conductance on temperature are also discussed.

TL;DR: In this paper, the thermal dependence of the Mn sublattice magnetic orderings within the RMn 2 X 2 (X = Si, Ge) compounds is proposed, and the occurrence of an in-plane antiferromagnetic Mn component (obviously correlated with a critical MnMn intralayer spacing value of ∼ 2.87 A ) over the whole ordered range leads to strongly revise the ferromagnetic ordering previously proposed to take place in such compounds.

TL;DR: In this article, the average size of the particles, determined by Transmission Electron Microscopy and by Small Angle X-Ray Scattering, varies from 2 to 5 nm, with less than 30% in polydispersity.

TL;DR: In this paper, a dc SQUID magnetometer was used to study the relaxations of six ferrofluids differing in particle size using nonlinear ln( t ) behavior in freeze-dried samples.

TL;DR: In this article, the pressure effect on the Curie temperature and thermal expansion for MnCoGe and MnCo0.8Ge was measured and the results showed that negative exchange striction was observed for the unit cell volume.

TL;DR: In this paper, the possibility of exchange interaction between ferromagnetic films across nonmagnetic metallic interlayers has been considered for a long time and was clearly identified and characterized in Fe/Cr structures and rare earth yttrium multilayers.

TL;DR: A comparative study of the remagnetization process of highly-magnetostrictive as-cast Fe-rich amorphous wires having different diameters (from 165 to 10 μm) and lengths (between 10 cm and 2 mm) is reported in this article.

TL;DR: In this article, dilute 57 Fe Mossbauer spectroscopy studies of RMn 2 X 2 (X = Si or Ge, R = La, Ce, Pr, Nd, Sm and Gd) at temperatures 4.2-650 K were conducted.

TL;DR: In this article, structural and electrical characterization of electrodeposited Co/Cu multilayers grown in a single electrolyte based on CoSO4 and CuSO4 is presented.

TL;DR: In this article, it was shown that nano-sized particles of cobalt ferrite produced by the coprecipitation method for use in magnetic fluids exhibit multiaxial anisotropy, which has not previously been reported for ferrite particles.

TL;DR: In this article, a simple case where the applied magnetic fields along and transverse to the duct axis are spatially uniform and varying sinusoidally with time is examined, and the governing linear and angular momentum conservation equations are numerically integrated to solve for flow and spin velocity distributions for zero and non-zero spin viscosities as a function of magnetic field strength.

TL;DR: In this article, the magnitude of exchange bias in a series of Fe 3 O 4 /CoO bilayers with constant and varying CoO thicknesses has been studied and compared with the value calculated under the assumption of nearest-neighbour exchange at a flat and magnetically uncompensated interface.

TL;DR: In this article, the first low-temperature/time-dependent magnetization experiments, performed on single sub-micronic particles and on arrays nanoparticles in molecular crystals, are described.

TL;DR: In this paper, the authors describe pulsed-magnetic field remanence measurements of individual, killed, undisrupted cells of three different types of magnetotactic bacteria, and show that for MM cells, the hysteresis loop is square, with the coercive field variable from cell to cell.

TL;DR: In this article, a modified version of the Damon-Eshbach theory of magnetostatic waves for in-plane magnetized anisotropic films is presented, relative to the usual backward volume wave, non-reciprocal surface wave, and surface mode critical angle properties for isotropic films.

TL;DR: In this article, the authors extend the understanding of perpendicular magnetic anisotropy beyond the phenomenological approach of volume (K V ) and interface anisotropies (K S ) to include other factors such as roughness, formation of interface alloys, or patchiness of ultrathin layers.

TL;DR: In this article, the influence of size and chemical composition of the particles upon dynamic permeability was studied, and the authors measured the Microwave permeability of metal particles-dielectric matrix composites in the 0.1-18 GHz range.

TL;DR: In this paper, a number of experiments were performed to investigate the temperature and concentration dependences of the initial susceptibility of magnetite ferrocolloids, taking into account magneto-dipole interparticle interactions.

TL;DR: In this paper, the surface flatness and the degree of layer ordering improve with increasing substrate temperature, and the perpendicular magnetic anisotropy and Kerr rotation (λ = 633 nm) at room temperature increase with increasing degree of order.