Saturation magnetostriction of Fe72.5-xCoxSi12.5B15 glass covered amorphous wires

摘要

Results concerning the saturation magnetostriction, lambda(s), dependence on the tensile stress applied during annealing as well as during measurements for Fe72.5-xCoxSi12.5B15 glass covered amorphous wires before and after glass removal are reported. The increase of the tensile stress during annealing leads to an increase of saturation magnetostriction at zero applied stress, lambda(s)(0), up to about 5% for highly magnetostrictive samples (Fe-based). For low magnetostrictive as well as for negative magnetostrictive samples (Co-based), when the value of tensile stress applied during annealing increases, changes up to 10% of lambda(s)(0) absolute value were observed. In the case of nearly zero magnetostrictive Fe4.35Co68.15Si12.5B15 samples, a change in lambda(s)(0) sign can be obtained by proper stress-current annealing. Increasing the tensile stress value during measurements, lambda(s) decreases for all tested samples. (C) 2004 Elsevier B.V. All rights reserved.