Stock material or miscellaneous articles – Composite – Of inorganic material
Patent
1993-05-28
1996-02-20
Thibodeau, Paul J.
Stock material or miscellaneous articles
Composite
Of inorganic material
428694TR, G11B 566
Patent
active
054927757
ABSTRACT:
A high-density recording media comprising longitudinally oriented polycrystalline barium ferrite exhibits large coercivity, corrosion resistance, high hardness and durability. Films are prepared by on-axis sputtering at ambient temperatures from stoichiometric targets followed by a post-deposition anneal at approximately 850.degree.C. to induce crystallization. Crystallization yields a magnetic film with large in-plane remanence and a fine scale texturing that greatly improves the tribological performance of barium ferrite disks. Exceptional durability can be achieved on disks without overcoats. Grain sizes as small as 200 .ANG. are produced by doping with small amounts of Cr.sub.2 O.sub.3 or other additives. Coercivities greater than 4000 Oe are achieved even in small grain films.
REFERENCES:
patent: 4438066 (1984-03-01), Aboaf et al.
patent: 4792497 (1988-12-01), Suzuki et al.
patent: 4816292 (1989-03-01), Machida
patent: 5034243 (1991-07-01), Chiba et al.
patent: 5084152 (1992-01-01), Lin
patent: 5094896 (1992-03-01), Morita et al.
patent: 5227204 (1993-07-01), Vittoria
Gerard et al., "Crystallization Phenomena in Thin Films of Amorphous Barium Hexaferrite", Solid State Communications, vol. 71, No. 1, pp. 57-62, 1989.
X. Sui et al. "Magnetic easy axis randomly in-plane oriented barium hexaferrite thin film media", Technical Report #98-08, Data Storage Systems Center, Apr. 23, 1993.
M. Matsuoka et al., "Ba-ferrite thin-film disk for perpendicular magnetic recording", J. Appl. Phys. 57(1), pp. 4040-4042, Apr. 1985.
M. Matsuoka et al., "Preparation of Ba-Ferrite Films for Perpendicular Magnetic Recording by RF Targets Facing Type of Sputtering", IEEE Trans. on Magnetics, vol. MAG-20, No. 5, pp. 800-802, Sep. 1984.
Ahlert Richard H.
Howard James K.
Hylton Todd L.
Parker Michael A.
Ullah Muhammad I.
International Business Machines - Corporation
Thibodeau Paul J.
Wilson James C.
LandOfFree
Barium ferrite thin film for longitudinal recording does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Barium ferrite thin film for longitudinal recording, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Barium ferrite thin film for longitudinal recording will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1355237