Coercivity and induced magnetic anisotropy by stress and/or field annealing in Fe- and Co- based ( Finemet-type) amorphous alloys

Abstract

Uniaxial magnetic anisotropy has been induced in amorphous Fe 73.5Cu 1Nb 3Si 15.5B 7 (Fe-rich) and (Co 77Si 13.5B 9.5) 90Fe 7Nb 3 (Co-rich) ferromagnetic alloys by annealing under stress and/or magnetic field. Such anisotropy plays a crucial role on the magnetization process and, consequently, determine the future applications of these materials. The mechanisms involved on the origin of such induced magnetic anisotropy showed significant differences between Fe-rich and Co-rich amorphous alloys. This work provides a comparative study of the coercive field and induced magnetic anisotropy in Fe-rich and Co-rich ( Finemet) amorphous alloys treated by stress and/or field.