Abstract
The dependence of soft magnetic properties on the annealing conditions for Co-based amorphous films with different thicknesses was investigated in detail, in order to obtain films having isotropically high initial permeability at high frequencies. It was found that the microscopic anisotropy of films annealed in a rotating field was increased isotropically by nonfield annealing below the Curie temperature (Tc). Thinner films having isotroplcally larger microscopic anisotropy showed isotroplcally higher initial permeability at high frequencies. This occured because the natural resonance frequency is increased by an increase in the microscopic anisotropy, and the influence of the eddy current on the initial permeability becomes a dominant factor at high frequencies.
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