Abstract
Six samples of Fe100−xGax (15⩽x⩽30) were prepared by melt spinning for a systemic investigation of the structure, magnetostriction, and magnetic properties of Fe–Ga alloys. A large magnetostriction (>750ppm) that increases with increasing Ga concentration has been observed in Fe100−xGax (15⩽x<25) ribbons melt spun at a wheel speed of 10m∕s. When x was equal to or greater than 25, the samples demonstrated magnetostriction of less than 200ppm. The abrupt decrease in magnetostriction at x=25 was attributed to the change in structure from disordered bcc to an ordered phase (DO3). The melt-spun Fe100−xGax (15⩽x⩽30) samples exhibited large saturation magnetization and high Curie temperature, which allowed the alloys to achieve the saturation magnetostriction under easily attainable fields. The angle dependence of the magnetostriction and the effect of the wheel speed are also discussed.
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