Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Physical dimension specified
Patent
1997-02-18
1998-12-08
Kiliman, Leszek
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Physical dimension specified
428336, 428694T, 428694TS, 428694TR, 428650, 428666, 428678, 428668, 428662, 428900, G11B 566
Patent
active
058466487
ABSTRACT:
A magnetic recording medium is provided with a structured nucleation layer. The structured nucleation layer comprises a fine-grained seed layer and an intermediate layer. The seed layer (e.g., NiAl, Ti, Cr--Cu, etc.) serves as a template for fine grained-growth of the intermediate layer. The intermediate (e.g., Cr, etc.) layer has preferred crystal textures and an appropriate lattice match to a subsequently deposited magnetic recording layer to allow epitaxial growth of the magnetic recording layer. The intermediate layer provides morphology and orientation to the magnetic recording layer. The magnetic recording layer (e.g., Co-alloy) includes a material which segregates to the alloy grain boundaries to isolate the grains thereof. Each grain of the magnetic recording layer is predominantly a single crystal of small size and uniformly spaced from adjacent grains. The easy axis of the magnetic recording material is predominantly in the plane of the disk, with a random in-plane orientation. Superior magnetic properties are obtained.
REFERENCES:
patent: 4652499 (1987-03-01), Howard
patent: 4769282 (1988-09-01), Tada
patent: 4786564 (1988-11-01), Chen
patent: 4837094 (1989-06-01), Kudo
patent: 4973525 (1990-11-01), Chien et al.
patent: 4988578 (1991-01-01), Yamashita et al.
patent: 5062938 (1991-11-01), Howard et al.
patent: 5066552 (1991-11-01), Howard
patent: 5162158 (1992-11-01), Christner
patent: 5314745 (1994-05-01), Okumura
patent: 5516547 (1996-05-01), Shimizu
patent: 5658659 (1997-08-01), Chen
Williams and Comstock, "An Analytical Model of the Write Process in Digital Magnetic Recording", 17th Annual AIP Conf. Proc., Part I, No. 5, 1971, pp. 738-742.
Zhu et. al., "Micromagnetic Studies of Thin Metallic Films", Journal of Applied Physics, vol. 63, No. 8, 1988, p. 3248.
Chen et. al., "Physical Origin of Limits in the Performance of Thin-Film Longitudinal Recording Media", IEEE Trans. Mag., vol. 24, No. 6, 1988, p. 2700.
Chein, C.L., et al., "Magnetic Granular Fe-SiO.sub.2 Solids", Journal of Applied Physics, vol. 61(B), 1987, p. 3311.
Liou, S.H., et al., "Granular Metal Films A Recording Media", Applied Physics Letters, vol. 52, No. 8, 1988, p. 512.
Shimizu et al., "CoPtCr Composite Magnetic Thin Films", IEEE Trans. Mag., vol. 28, No. 5, 1992, p. 3102.
Murdock et al., "Noise Properties of Multilayered Co-Alloy Magnetic Recording Media", IEEE Trans. Mag., vol. 26, 1990, pp. 2700-2705.
Yogi et al., "Longitudinal Media for 1 Gb/in.sup.2 Areeal Density", IEEE Trans. Mag. vol. 26, 1990, p. 2271.
Lee et al., "NiAl Underlayers for CoCrTa Magnetic Thin Films", IEEE Trans. Mag., vol. 30, No. 6, pp. 3951-3953 (Nov. 1994).
Lee et al., "Effects of Cr Intermediate Layers on CoCrPt Thin Film Media on NiAl Underlayers", IEEE Trans. Mag., vol. 31, No. 6, pp. 2728-2730 (Nov. 1995).
Maeda, H., "High Coercivity Co and Co-Ni Alloy Films", J. Appl. Phys., vol. 53, No. 5, pp. 3735-3739 (May 1982).
El-Hilo, et al., "Interactions In CoPtCr/SiO.sub.2 Composite Thin Films", IEEE Trans. Mag. vol. 29, No. 6, pp. 3724-3726 (Nov. 1993).
Thompson, et al., "The Effects of Oxygen On Cobalt Titanium and Cobalt Platinum Thin Films", IEEE Trans. Mag., vol. Mag-22, No. 5, pp. 635-637 (Sep. 1986).
Deng et al., "Mangetic Properties and Crystal Texture of Co Alloy Thin Films Prepared on Double Bias Cr", J. Appl. Phys., vol. 73, No. 10, pp. 6677-6679 (May 15, 1993).
Hono, K., et al., "Crystallography of Co/Cr bilayer magnetic thin films", Journal of Applied Physics vol. 68, Nov. 1990.
D. J. Chakrabarti, et al, Chromium--Copper, Bull. Alloy Phase Diagrams, 5(1), Feb. 1984.
Chen Tu
Imakawa Makoto
Mitarai Kazuhiko
Suekane Michinobu
Kiliman Leszek
Komag, Inc.
Small Jonathan A.
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