Perpendicular magnetic recording medium with multilayered protec

Details Perpendicular magnetic recording medium with multilayered protec Perpendicular magnetic recording medium with multilayered protec

1986-06-26

1988-05-31

Robinson, Ellis P.

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Structurally defined web or sheet

Including components having same physical characteristic in...

427128, 427131, 427132, 428216, 428217, 428335, 428336, 428446, 428450, 428694, 428695, 428704, 428900, G11B 572

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active

047480734

ABSTRACT:
A perpendicular magnetic floppy disk has a base layer on each side of which a recording layer is formed having an axis of easy magnetization in a direction perpendicular to its surface. A multilayered protective layer structure is provided on the recording layer. The protective layer structure includes double-stacked non-magnetic thin-film layer structures made of an Si-N-O-based film and silicon oxide film, respectively. The total thickness of the multilayered protective layer structure is smaller than 40 nanometers, which is thin enough to maximize an efficiency in perpendicular magnetic recording of data signal.

REFERENCES:
patent: 4124736 (1978-11-01), Patel
patent: 4162350 (1979-07-01), Yanagisawa
patent: 4187344 (1980-02-01), Fredriksson
patent: 4307156 (1981-12-01), Yanagisawa
patent: 4390562 (1983-06-01), Yanagisawa
patent: 4411963 (1983-10-01), Aine
patent: 4419381 (1983-12-01), Yamazaki
patent: 4503125 (1985-03-01), Nelson
patent: 4701374 (1987-10-01), Sagoi
Digest, 4th Ann. Conf. on Mag., Japan, p. 132, T. Nishimura et al., NTT, Nov. 1980.

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