Magnetic Structure and Magnetoimpedance Effect in Stress-Annealed Cobalt-Based Amorphous Ribbons with Different Values of Induced Magnetic Anisotropy

摘要

The magnetoimpedance effect, induced magnetic anisotropy, and domain structure are investigated in the amorphous Fe_3Co_(67)Cr_3Si_(15)B_(12) ribbons with a nearly zero magnetostriction, in which a transverse magnetic anisotropy was induced by stress annealing using different regimes. The dependence of the relative change in the magnetoimpedance #DETLA#Z/Z on the frequency f is measured in a frequency range f= 0.1-2 MHz at current amplitudes of 3.0, 3.5, and 4 mA. Distinctions in the magnetoimpedance behavior were observed for the samples with the same constants of the transverse magnetic anisotropy induced at temperatures 250 and 350 deg C, e.g., in the hysteresis behavior of #DELTA#Z/Z in a magnetic field in ribbons subjected to certain regimes of thermomechanical treatment. The correlation between the magnetoimpedance, induced magnetic anisotropy parameters, and magnetic domain structure is analyzed.