Domain structures of Co-Zr-Nb amorphous film for main-poles of single-pole type perpendicular magnetic recording head have been observed with the Bitter method. A narrower Co-Zr-Nb main-pole having lower Hk shows the disordered domain structure near the tip in the remanent state. It causes lower and unstable sensitivity of the narrow-track single pole head. The rotation magnetization of main domains works dominantly in the magnetization of a stable main-pole. A stable and highly sensitive single-sided single pole head is obtained by using a shorter main pole having the aspect ratio of about 1, which shows an ordered and stable domain structure even in the remanent state.
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Nakamura et al. (1988) studied this question.