Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Physical dimension specified
Patent
1997-11-04
1999-09-14
Kiliman, Leszek
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Physical dimension specified
428336, 428694T, 428694TS, 428694TM, 428900, G11B 566
Patent
active
059520973
ABSTRACT:
Double layer, or bi-layer, magnetic films are deposited over a substrate with an underlayer. The bi-layer film is a film of two different magnetic layers which have different chemical composition, deposited with no spacer layer between the two layers. The lower magnetic layer should be of a low noise magnetic material, while the upper magnetic layer should be a high coercivity magnetic material. The bi-layer film exhibits a single response to magnetic recording and a joint coercivity different from the coercivity of either layer by itself. A preferred double layer media uses a CoCrTa layer deposited under a CoCrTaPt layer, with the CoCrTa layer comprising 30 to 70% of the total film thickness. The double layer film produces magnetic media with higher coercivity and lower media noise as compared to single layered films of either of the materials of the magnetic layers.
REFERENCES:
patent: 4652479 (1987-03-01), Suzuki
patent: 4749628 (1988-06-01), Ahlert
patent: 4950548 (1990-08-01), Furusawa et al.
patent: 4990362 (1991-02-01), Kibe et al.
patent: 5188907 (1993-02-01), Kawahara
patent: 5432012 (1995-07-01), Lal
patent: 5474830 (1995-12-01), Yamaguchi et al.
patent: 5558945 (1996-09-01), Miyazaki
patent: 5605733 (1997-02-01), Ishikawa et al.
patent: 5607783 (1997-03-01), Onodera
patent: 5744256 (1998-04-01), Goda et al.
patent: 5763071 (1998-06-01), Chen
patent: 5772857 (1998-06-01), Zhang
CoCrPt Media on HCP Intermediate Layers, Fang et al., Data Storage Center Review Presentations, Nov. 1, 1994.
A Study of Magnetic Recording Media on Glass Substrates, Shalin Duan et al., IEEE Transactions on Magnetics, vol. 30, No. 6, Nov. 1994.
NiAl Underlayers for CoCrTA Magnetic Thin Films, Li-Lien Lee et al., IEEE Transactions on Magnetics, vol. 30, No. 6, Nov. 1994.
High Coervicity and Low Noise Media Using Glass Substrate, Xiaoxia Tang et al., IEEE Transactions on Magnetics, vol. 30, No. 6, Nov. 1994.
Kiliman Leszek
Seagate Technology Inc.
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