Abstract
Magnetic properties of narrow stripe Co-Ta-Zr amorphous films with induced anisotropy across the stripe width have been investigated. Permeability of the films decreases with a decrease in the stripe width. This can largely be explained by the increased demagnetization field which may reduce the initial anisotropy and rotate the easy axis to the direction perpendicular to the initial easy axis, or change the magnetic domain structures. Film stress may act positively or negatively on this, depending on the film's magnetostriction constant. It is, therefore, essential to determine an appropriate magnitude of induced anisotropy and to choose a proper combination of magnetostriction constant and thermal expansion coefficient of the substrate. Utilizing this knowledge, thin film heads with 5μm track width have been fabricated. Reproduced voltage of 380μVpp/mm · turn · m/s has been obtained when operated with Co-Cr perpendicular recording medium.
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