MIG head which has metal magnetic thin film in the gap, has been developed for high coercivity medium. But the head has problems of the pseudo output caused by the pseudo gap at the boundary plane between Fe-Al-Si alloy thin film and ferrite, and low R/W efficiency. The pseudo gap is caused by a damaged layer in the ferrite and the first layer of Fe-Al-Si film that is about 0.1 μm thick and about 10 in permeability. The result that the first layer is examined in the magnetic characteristics presents that it causes the pseudo output. These problems are solved by inserting Ni-Fe intermediate thin film between Fe-Al-Si film and ferrite, which lowers coercive force of Fe-Al-Si thin film and significantly reduces the pseudo output.
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Tomiyasu et al. (1987) studied this question.