Magnetostriction of Amorphous (Fe,Pr)-B Alloys

Abstract

Amorphous Fe₈₆_ _x B₁₄Fr _x (2 « x « 8 at.%) alloys were prepared by rapid solidification process in order to investigate the effects of Pr-additive on the magnetostriction of amorphous Fe-B alloys. As the Pr content increases in the as-prepared amorphous Fe₈₆_ _x B₁₄Pr _x alloys, the saturation magnetostriction constant, λ_s increases to 50 ppm despite of decrease of saturation magnetization. The saturation magnetostriction constant of amorphous Fe₈₄B₁₄Pr₂ alloy annealed at 300° C for 2 h increases to 70 ppm. The power loss and ac permeability (E = 50 kHz, B_m = 0.1 T) of the annealed amorphous Fe₈₄B₁₄Pr₂ alloy are 15 W/kg and 5.5 χ 10³, respectively.