Stock material or miscellaneous articles – Composite – Of inorganic material
Patent
1997-09-03
2000-04-04
Pianalto, Bernard
Stock material or miscellaneous articles
Composite
Of inorganic material
2041921, 427130, 427131, 427132, 427294, 427331, 427399, 428336, 428457, 428629, 428632, 428639, 428650, 428667, 428694TP, 428900, 428928, G11B 566
Patent
active
06045931&
ABSTRACT:
A magnetic recording medium comprising a cobalt-samarium magnetic alloy layer is formed having a high aerial recording density and exhibiting high coercivity, utilizing an underlayer with a thin nucleation layer thereon. Embodiments include sputter depositing a Cr or Cr alloy underlayer on a non-magnetic substrate, including alternative substrates, and sputter depositing a thin nucleation layer comprising Cr or a Cr alloy on the underlayer. A CoSm alloy layer is sputter deposited on the nucleation layer under substantially the same inert gas pressure as the nucleation layer, whereby Cr diffuses from the nucleation layer into and alloys with the CoSm magnetic alloy layer, thereby increasing media coercivity and corrosion resistance, and reducing media noise. A Cr overcoat on a CoSm alloy layer greatly reduces the oxidation of CoSm, thereby improving its corrosion resistance.
REFERENCES:
patent: 5846648 (1998-12-01), Chen et al.
Velu et al., "A Structure and Media Noise of SmCo/cr Thin Films and Hard Disks," J. Appl. Phys. 75(10), May 15, 1994, 1994 American Institute of Physics, pp. 6132-6134.
Murdock "Roadmap for 10 Gb/in2 Media: Challenges," IEEE Trans. Magn. vol. 28,, No. 5,pp. 3078-3083, Sep. 1992.
Kullman et al. "Amosphous COSM Thin Films : A New Material for High Density Longitudinal Recording," IEEE Trans, Magn., vol. 20, No. 2,pp. 420-424 Mar. 1984.
Velu et al. "CoSm-based high-coercivity thin films for longitudinal recording.," J. Appl. Phys. 69(8) pp. 5175-5177, Apr., 1991.
Chen Ga-Lane
Leu Charles Chengyea
Song Xing
Pianalto Bernard
Seagate Technology Inc.
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