抄録
Magneto-optical microscopy using digital image processing is applied to observation of magnetization bit patterns in double-layer media. The bit patterns are found to depend on pole shapes and magnetomotive force. A reversal domain is observed on both sides of a track if the leading pole of the head is wider than the trailing one. The reason is that magnetization bits are written not by the longitudinal component but by the vertical component of head field. Moreover, the patterns become obscure with increasing magnetomotive force because of the saturation of media underlayers. Thin film heads with double-layer media can perform adequately in perpendicular recording by designing pole shapes and setting the magnetomotive force.
