MAGNETIC-BEHAVIOR OF THE AMORPHOUS WIRES COVERED BY GLASS

Magnetic properties are presented of amorphous wires covered by glass, with the compositions Fe65B15Si15C5, Fe60B15Si15Cr10, and Fe40Ni40P14 B6, which were prepared by melting the alloy in glass tubes and drawin g fibers from the softened glass. The magnetization, the remanence, an d the coercive force of the samples covered by glass, and of those obt ained after removing the glass cover, were measured at a field of 2054 A/m. These amorphous wires have a square-shaped hysteresis loop, a va lue 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 re moval leads to an increase in magnetization and a decrease in the coer cive force. The influence of a passing dc current through the wire dur ing measurements has also been studied, influence that is much pronoun ced in the case of the wires obtained after removing the glass cover. The observed different magnetic properties of the amorphous magnetostr ictive wires are attributed to the difference in internal stress distr ibution produced during preparation of the samples.