NEW SOFT-MAGNETIC MATERIAL WITH CONSTANT AND ADJUSTABLE PERMEABILITY

New metallic magnetic ribbons with permeability of several hundreds an d magnetic loss comparable to that of Mn-Zn ferrites were developed by crystallizing amorphous Fe-Cu-Nb-Si-B ribbons. Although the magnetic properties of as-annealed ribbons showed remarkable unstability, they were stabilized by exposing the ribbon to large flux density before us age, The permeability of the stabilized ribbons could be adjusted to t he desired value by controlling the flux density exposed for stabiliza tion, The stabilized permeability was constant up to 400kHz independen t of the excited flux density, as long as the excited flux density did not exceed the flux density used for stabilization.