Abstract
Magnetic properties are presented of amorphous wires covered by glass, with the compositions Fe65B15Si15C5, Fe60B15Si15Cr10, and Fe40Ni40P14B6, which were prepared by melting the alloy in glass tubes and drawing fibers from the softened glass. The magnetization, the remanence, and the coercive force of the samples covered by glass, and of those obtained after removing the glass cover, were measured at a field of 2054 A/m. These amorphous wires have a square-shaped hysteresis loop, a value of the coercive force ranging between 255 and 462 A/m and an axial magnetization of 0.21–0.32 T for different compositions. The glass removal leads to an increase in magnetization and a decrease in the coercive force. The influence of a passing dc current through the wire during measurements has also been studied, influence that is much pronounced in the case of the wires obtained after removing the glass cover. The observed different magnetic properties of the amorphous magnetostrictive wires are attributed to the difference in internal stress distribution produced during preparation of the samples.
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