COERCIVITY AND REMANENCE OF AMORPHOUS AND NANOCRYSTALLINE FE-(CU,TA)-SIB RIBBONS

We report on the evolution, with the thermal treatment parameters, of the remanence and coercive force of amorphous melt spun ribbons having compositions of Fe77.5Si13.5B9,Fe76.5Cu1Si13.5B9, and Fe74.5Ta3Si13.5 B9. The thermal treatments were carried out by using the current annea ling technique with and without the simultaneous application of a tens ile stress along the axis of the samples. Our results show that upon l ow temperature (low current), short time treatments both the remanence and the coercive force are basically determined by the characteristic s of the effective anisotropy induced during the treatment. In contras t, high temperature (high current) treatments result in values of both quantities that are linked to the (partial or total) accomplishment o f the first stage of the crystallization process of the samples. (C) 1 996 American Institute of Physics.