MAGNETIC-PROPERTIES AND CRYSTALLIZATION OF AMORPHOUS CO100-X-YBXZRY ALLOYS

The magnetic properties and crystallization behavior of amorphous Co(100-x-y)B(x)Zr(y) (0 less-than-or-equal-to x less-than-or-equal-to 25; y = 10, 16) alloys were studied. In amorphous Co(90-x)B(x)Zr10 alloys the average magnetic moment per cobalt atom and Curie temperature are found to decrease monotonically with increasing boron concentration x, and the crystallization temperature increases linearly. The crystallized Co(90-x)B(x)Zr10 alloys have a small coercive field. However, high coercive fields are observed in the crystallized Co(84-x)B(x)Zr16 alloys. The room-temperature coercive field H(c) in the optimal heat-treated samples is found to increase monotonically with increasing x from 2.2 kOe for x = 0 to 4.7 kOe for x = 16. The remanent magnetization B(r) (at H = 8 kOe) and energy product (BH)max for the Co84Zr16 alloy annealed at 660-degrees-C for a short time are obtained to be 6.1 kG and 4.2 MGOe, respectively.