Abstract
Induced anisotropy of soft-magnetic underlayers (SUL) were pinned to radial and circumferential directions in double-layered perpendicular media, and effects of the directions on recording properties were studied for Fe–Pt media. A medium with the SUL of radial anisotropy showed a sharper cross-track profile than that of a medium with the SUL of circumferential anisotropy. Furthermore, signal-to-noise ratio (SNR) of the former was found to be 4dB higher than that of the latter at 500kfrpi. A SUL of radial anisotropy with an anisotropy-dispersion narrower could result in suppressing the fluctuation of write-field gradient and lead to further high SNR.
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