Stress-Anneal-Induced Magnetic Anisotropy
in an Amorphous Alloy Fe₃Co₆₇Cr₃Si₁₅B₁₂

G. V. Kurlyandskaya, N. V. Dmitrieva, A. P. Potapov, V. A. Lukshina,
L. M. Voronova, I. V. Gervas’eva, and N. G. Bebenin

Institute of Metal Physics, Ural Division, Russian Academy of Sciences,
ul. S. Kovalevskoi 18, Ekaterinburg, 620219 Russia

Received October 25, 1996

Abstract—Thermomechanical-treatment-induced magnetic anisotropy was studied in thin ribbons of the
Fe₃Co₆₇Cr₃Si₁₅B₁₂ amorphous alloy possessing a low Curie temperature. The values of the magnetic anisotropy
constants were determined from analysis of magnetization curves measured in a magnetic field oriented parallel
and perpendicular to the ribbon plane. The magnetization curves can be described by three anisotropy con-
stants; their values were shown to increase with increasing temperature of thermomechanical treatment. The
induced magnetic anisotropy is supposed to be due to structural inhomogeneities arising during thermomechan-
ical treatment. Using X-ray diffraction, microhardness measurements and magnetic measurements of samples
that, after thermomechanical treatment, were subjected to a relaxation annealing without load, we showed that
the nature of the structural inhomogeneities and, consequently, the mechanism of the formation of stress-
induced anisotropy does not relate directly to the process of crystallization of the alloy under study.

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