Vertical magnetic recording media with multilayered magnetic fil

Details Vertical magnetic recording media with multilayered magnetic fil Vertical magnetic recording media with multilayered magnetic fil

1985-09-23

1987-06-30

Sheehan, John P.

Stock material or miscellaneous articles

All metal or with adjacent metals

Having magnetic properties, or preformed fiber orientation...

428626, 428630, 428634, 428641, 428651, 428652, 428678, 428607, 428928, 428679, 428680, 428681, H01F 100

Patent

active

046770321

ABSTRACT:
A thin film metal alloy medium for vertical recording has a magnetic film structure of individual films, each film being made up of a non-magnetic layer and a magnetic layer. In a preferred embodiment of the medium, each of the layers is a cobalt-chromium-tantalum (CoCrTa) alloy, the tantalum concentration being varied in the different layers in order to provide either the non-magnetic or the magnetic properties to the layers. The medium also includes a soft magnetic underlayer film structure between the substrate and the magnetic film structure to provide a magnetic flux return path. Each film in the underlayer film structure comprises a CoCrTa non-magnetic layer and a CoCrTa magnetic layer, each magnetic layer being sufficiently thin such that the underlayer film structure exhibits in-plane magnetization with no perpendicular magnetic anisotropy.

REFERENCES:
patent: 4548871 (1985-10-01), Kobayashi et al.
patent: 4592948 (1986-06-01), Kohmoto et al.
patent: 4594296 (1986-06-01), Noguchi et al.
patent: 4599280 (1986-07-01), Izumi et al.
"Magnetization and Structure of Mn-Ni and Mn-Co Layered Magnetic Thin Films", J. Appl. Phys. 53(3), Mar. 1982, pp. 2436-2438.
"High Density Perpendicular Magnetic Recording on Rigid Disks", Fujitsu Sci. Tech. J., 19, 1, pp. 99-126, Mar. 1983.
"Recording on Perpendicular Anisotropy Media with Ring Heads", IEEE Transactions on Magnetics, vol. Mag-17, No. 6, Nov. 1981, pp. 2547-2549.

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