Magnetic properties of FeCoV film sandwiched by thin soft-magnetic films

Soft magnetization of FeCoV thin films has been examined experimentally. Th e coercive force of FeCoV films decreases by more than 90% with little redu ction in saturation magnetization or changes in magnetization behavior when films are sandwiched between two thin FeNiMo soft-magnetic layers making u p about 2% of the total volume. It can be assumed that a magnetic wall, par allel to the film surface and formed at the interface between the soft-magn etic layer and the FeCoV layer, will readily propagate into the FeCoV layer . The thickness of the soft-magnetic layer necessary for the magnetic wall formation is thought to be about 50 similar to 100 Angstrom. The reduction in coercive force seems to be related to the anisotropy of the magnetic pro perties of the thin soft-magnetic layer. In the case of Fe films, however, a reduction in coercive force due to the thin soft-magnetic layer never occ urs. Whether the thin soft-magnetic layer has effects on the crystal struct ure of FeCoV or Fe layers, will be examined experimentally in the future.