Soft magnetic properties of Fe-C/Ni-Fe multilayered films

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Abstract
The paper examines soft magnetic properties and film structures of Fe-C/Ni-Fe multilayers formed by the dual ion-beam sputtering method. The following results are obtained. (1) The addition of C to Fe improves the soft magnetic properties of Fe, making its magnetostriction constant zero while keeping its high saturation magnetic flux density. (2) The insertion of Ni-Fe intermediate layers between Fe-C layers further improves the soft magnetic properties to a relative permeability of 3000, with a saturation magnetic flux density of 2.0 T. (3) The improvements in the soft magnetic properties are due to reductions in the magnetic anisotropy dispersions and the mean anisotropy field, which in turn are due to reduction of crystallite diameter.