Abstract
The domain structures of cores with patterned Permalloy films have been investigated in order to develop magnetic recording thin film heads with narrow track widths. For single-layered Permalloy films, domain patterns indicate that the writing and reading abilities decrease when the track width becomes less than 10 ?m. For six-layer Permalloy films with an alumina interlayer of 0.02 ?m, domain patterns show that domain walls remain oriented along the direction of the track width, even for a width of 7 ?m. Furthermore, six-layer Permalloy films with small anisotropy fields show no change in wall position when an external magnetic field is applied along the hard axis. It is thus concluded that six-layer Permalloy films with small anisotropy fields are most suitable for use in magnetic thin film heads with narrow track widths.
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