Magnetostriction of Amorphous Fe-Y and (Fe-Co)0.8Y0.2 Alloys

The magnetostriction of Fe1-xYx (0.2¿x¿0.6) and of (Fe1-x Cox)0.8Y0.2 (0¿x¿0.6) alloys has been measured in the temperature range from 20 to 300 K. In Fe-Y alloys, the magnetostriction ¿ is 2.8×10^¿6 at 20 K when x=0.2, and decreases monotonically with increasing x and temperature. This magnetostriction in FeY alloys is the smallest among all Fe-based amorphous binary alloys investigated so far. In (Fe1-xCox)0.8Y0.2 alloys ¿ at room temperature shows a minimum of 1.0×10^¿6 at x-0.3, at which the magnetization and coercive force are 125 emu/g and 0.05 Oe respectively.