Abstract
The magnetic domain structures of thin film head with NiFe films, driven by DC and AC currents, were investigated in order to evaluate the magnetization process under high frequency magnetic field using spin-polarized SEM. The image contrast under high frequency magnetic field was calculated as the time average component of the magnetization along the detection direction for the magnetization rotation and the reversible domain wall movement. From the relation between the observed domain images and the calculated distribution of the average magnetization about the domain wall, it was found that irreversible domain wall movement occurs in the overall magnitc core under the high frequency excitations. A domain wall moves slightly and reversibly until the direction of the magnetic field attains reverse under the high frequency excitation.
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