Thin film medium for horizontal magnetic recording having an imp

Details Thin film medium for horizontal magnetic recording having an imp Thin film medium for horizontal magnetic recording having an imp

1987-01-20

1988-12-06

Robinson, Ellis P.

Stock material or miscellaneous articles

Self-sustaining carbon mass or layer with impregnant or...

427128, 427131, 20419216, 2041922, 428446, 428694, 428695, 428704, 428900, 428666, 428670, 428928, G11B 564

Patent

active

047895985

ABSTRACT:
An improved thin film metal alloy media for horizontal magnetic recording has a magnetic layer of an alloy comprising cobalt, platinum and chromium, where the chromium concentration in the alloy is greater than 17 at.%. The media exhibits unexpectedly high signal-to-noise ratio (SNR) and minimal time jitter, thereby resulting in a media which is capable for use at high linear recording density. The media also exhibits excellent corrosion resistance because of the chromium present in the alloy, thereby eliminating the need for a barrier layer between the magnetic layer and the protective overcoat.

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James E. Opfer et al., "Thin-Film Memory Disc Development", Hewlett-Packard Journal, vol. 36, No. 11 (Nov. 1985), pp. 4-10.
J. A. Aboaf et al., "Magnetic Properties and Structure of Cobalt-Platinum Thin Films", IEEE Trans. on Magnetics, vol. MAG-19, No. 4 (Jul. 1983), pp. 1514-1519.
Eric R. Katz et al., "Effect of Bitshift Distribution on Error Rate in Magnetic Recording", IEEE Trans. on Magnetics, vol. MAG-15, No. 3 (May 1979), pp. 1050-1053.
Nathan R. Belk et al., "Measurement of the Intrinsic Signal-to-Noise Ratio for High-Performance Rigid Recording Media", J. Appl. Phys., 59(2) (Jan. 15, 1986), pp. 557-563.
J. T. Jacobs, "PtCoCr Films for Digital Magneto-Optic Recording", IBM Technical Disclosure Bulletin, vol. 17, No. 12 (May 1975), pp. 3714-3715.

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