Perpendicular magnetic recording medium, method of...

Stock material or miscellaneous articles – Magnetic recording component or stock – Thin film media

Reexamination Certificate

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C428S836200, C428S829000, C428S830000, C360S131000, C427S127000, C216S022000

Reexamination Certificate

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07923134

ABSTRACT:
Embodiments of the present invention help to provide a discrete track medium for realizing a high track density in a low price by adopting a configuration, in which filling of a non-magnetic material into a guard band portion and smoothing processing of a medium surface are not required. According to one embodiment, a perpendicular magnetic recording medium, on the non-magnetic substrate, includes at least: a soft magnetic underlayer; a first recording layer including a crystal grain having a magnetic property and a non-magnetic grain boundary having an oxide, as a main component, surrounding the crystal grain; a second recording layer containing a ferromagnetic metal as a main component and not containing an oxide; and at least one non-magnetic layer provided between the first recording layer and the second recording layer. A recording track portion for magnetically recording information and a guard band portion provided between adjacent recording track portions are included in the perpendicular magnetic recording medium. The relationship between the total thickness t1of the non-magnetic layer in the guard band portion and the total thickness t2of the non-magnetic layer in the recording track portion is set as t1>t2.

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Zheng et al. “Role of Oxygen Incorporation in Co-Cr-Pt-Si-O Perpendicular Magnetic Recording Media” IEEE Transactions on Magnetics, vol. 40, No. 4, Jul. 2004.

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