Abnormal electrical resistivity of Co-Fe-Si-B-Nb-R alloys in amorphous and crystalline states

Abstract

Electrical resistivity of Co48Fe25Si4B19Nb4 amorphous alloy and with small additions of rare-earth metals ( = Nd, Sm, Tb, Yb) was studied using the AC four-probe method. It was found that these alloys have a specific behavior of electrical resistivity after crystallization-temperature dependences of resistivity at cooling are non-linear and can be fitted as ln R~ T-1/4. Keywords: amorphous alloys, metallic glasses, electrical resistivity, rare-earth metals.