MAGNETIC-PROPERTIES AND MAGNETOSTRICTION AT ROOM-TEMPERATURE OF THE AMORPHOUS RARE EARTH-FE ALLOYS (RBFECOCU) (R = ND, SM)

The following three systems of the amorphous alloy specimens have been prepared and measured: NdxB20-x (Fe78Co1.7Cu0.3)(x = 0, 1, 2, 3, 4, 5 ), SmxB20-x (Fe78CO17Cu0.3)(x = 0, 1, 3), Fe79.7-xCox (Cu0.3B17Sm3)(x = 0, 1.7, 3.7, 5.7, 7.7). The results show that the specific magnetizi ng moment sigma(s) varies with temperature T, and that the anisotropy constant K(u) and saturation magnetostriction constant lambda(s) vary with composition x at room temperature. It is shown that small amounts of rare earth elements alloyed into Fe-based amorphous alloys can inc rease K(u), lambda(s) and the crystallization temperature T(cr) of the amorphous alloys. It stands to reason that the local magnetic anisotr opy and the exchange interaction are both effected. Although sigma(s) and T(c) may decrease as the small amount of R elements is alloyed, th ey can be compensated with an increase in the composition of Co.