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

The magnetostriction of Fe
_1-x
Y
_x
(0.2≤xɤ0.6) and of (Fe
_1-x
Co
_x
)
_0.8
Y
_0.2
(0≤x≤0.6) alloys has been measured in the temperature range from 20 to 300 K. In Fe-Y alloys, the magnetostriction λ 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 (Fe
_1-x
Co
_x
)
_0.8
Y
_0.2
alloys λ 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.