The Effect of Addition of Rare Earth Elements on Magnetostriction in bec Fe-Co Alloys

The magnetostriction and magnetic properties of bcc Fe-Co-Sm alloys produced by dc triode sputtering have been investigated. Addition of 3 at% Sm suppressed the large positive magnetostriction of bec Fe-Co alloys, resulting in almost zero magnetostriction for bcc Fe
0.7
C
0.3
alloys. These nonmagnetostrictive alloys show a high saturation magnetization of about 210 emu/g, and thus are thought to be useful as soft magnetic materials.