The cause of drastic decrease of coercive force in FeCoV and FeNiMo films due to sandwiching by thin FeNiMo layers (about 2% in volume) is studied. The features of magnetization processes of these multi-layer films are investigated by observation of magnetization curves and magnetic domain structures. The drastic reduction in coercive forces seems to be related to anisotropic magnetization of very thin FeNiMo film which was evaporated firstly on the substrate.
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