M. Imamura

Magnetization process and magnetostriction of a four percent Si-Fe single crystal close to

The magnetization process in a cube-on-edge Si-Fe single crystal whose tilt angle θ of the [001] axis to a specimen surface is small is experimentally clarified and explained from the viewpoint of the magnetic energy. The relation between the magnetostriction and the domain structure varying with induction is made clear. It is shown that the magnetostriction in the specimen used is quantitatively explained from consideration of the variation of volume of the 90° domain within a lancet structure, which expands or contracts accompanied with a displacement of the main 180° walls in the region of 0 \leq B and also with variation of the magnetizing force that directly acts upon the lancet domains in the region of B_{merge} \leq B .

AC magnetostriction in Si-Fe single crystals close to

The relation between the ac magnetostriction and magnetization processes as to Si-Fe single crystals close to the

Domain-wall eddy-current loss in a stripe domain structure of Si-Fe crystals inclined slightly from the perfect

The fundamental relationship between the domain structure and the eddy current loss of a cube-on-edge Si-Fe single crystal whose angle of inclination of the [001] axis to a specimen surface is small is clarified. A model domain structure shows that the perpendicular component of magnetization which appears from this inclination affects the domain width, the permeability, and the eddy current loss. The dependence of iron losses on angle of inclination observed in specimens having some inclination from the ideal cube-on-edge orientation is elucidated by a newly proposed idea. This idea suggests the existence of the in-plane eddy current component due to a change of magnetization in the direction perpendicular to the specimen surface.

Magnetic properties and relaxation processes of magnetic anisotropy in amorphous magnetic ribbons due to heat treatment

Thermally activated processes for as-quenched samples of amorphous ribbons of five kinds in which the sample possessing the negative λ is included are studied. It has been shown that the processes depend on the number and species of transition elements included in ribbons. Ribbons including plural transition elements have respectively different values of ΔE at each stage of activated process. The brittle ribbon in the as-quenched state has larger time constants and higher activation energies than the others. The estimated values of activation energies were ranging from 0.7 eV to 1.8 eV. They are regarded as the energies which correspond with the stress relief. No. influence of the sign of λ on the processes has been observed. Only the FeNiPB ribbon has shown the complex variation of magnetic properties with annealing.

A spiral new element using amorphous ribbons with the field-induced anisotropy

A magnetoelastic wave element using amorphous ribbons carrying the field induced anisotropy is proposed. The (Fe 0.5 Ni 0.5 ) 80 B 20 ribbon is used in this element as a medium of MEW propagation and a change rate of delay of about 20 % at a frequency of 100 kHz can be obtained. The change rate of delay increases monotonically with increasing bias field lower than an anisotropy field H a . This delay characteristic can be explained well by results from theoretical analyses.

Power losses in metallic soft magnetic materials at extremely low frequencies

Abstract Total power losses per cycle at extremely low frequencies have been confirmed to show a logarithmic deviation from the linear law of loss variation with frequency for 79% Ni-Fe, 50% Ni-Fe and 3% Si-Fe sheets. This deviation is attributed to the thermal fluctuation aftereffect which occurs even in soft magnetic materials.