Magnetostriction and magnetoelastic effects in certain amorphous alloys

Magnetoelastic phenomena in amorphous transition metal-metalloid alloys have been studied. It was found that the magnetoelastic coupling coeficient B(0) of amorphous FeSiB alloys depends mostly on the Fe content, and does not depend significantly on the B/Si ratio. The value of B(0) exhibits a maximum at about 80 at% Fe. The forced volume magnetostriction is a strongly increasing function of iron concentration above 75 at% Fe. The ΔE effect of as-quenched amorphous alloys is not a simple function of saturation magnetostriction λs. The ΔE effect is proportional to the magnetomechanical coupling coefficient. The observed magnetoelastic effects may be related to the appearance of weak ferromagnetism in Fe-base amorphous alloys.