Abstract
A direct observation of the in-plane domain structure of the writer pole of a perpendicular recording head was performed by electron holography in order to investigate the cause of pole erasure due to the instability of the domain wall behavior. The instability of domain structure of the writer pole generated a stray field on the air bearing surface of the writer pole. The domain wall trapping at the pole tip was found quite effective to form a stable domain structure in the remanent state, and it reflected domain wall energy change and initial domain structure of the writer pole.
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