Magnetization processes in a thin-film recording head

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Abstract
The switching dynamics of a Ni-Fe thin-film head during the writing process have been studied in some detail. It was found that magnetization changes, via both domain wall motion and magnetization rotation, were executed in such a way as to avoid pole formation at the domain boundaries. Unlike the case of the reading process studied previously, it was found that the switching speed and frequency response of the head could be increased by increasing the write field. However, the field required to saturate the head in the hard direction has been observed to be as much as one order of magnitude larger than the anisotropy field of 1 or 2 Oe. Means of maximizing the write field for a given driving ampere-turns are discussed in the context of the head geometry.

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