Perpendicular magnetic recording medium and production process t

Details Perpendicular magnetic recording medium and production process t Perpendicular magnetic recording medium and production process t

1985-08-19

1987-08-18

Wolff, John H.

Dynamic magnetic information storage or retrieval

Record medium

Disk

360134, 2041922, 20419235, 428694, G11B 578

Patent

active

046881301

ABSTRACT:
A perpendicular magnetic recording medium is formed of a substrate having 5.times.10.sup.5 -5.times.10.sup.9 fine projections per mm.sup.2 on the surface thereof, said projections having heights in the range of 0.01-10 .mu.m and diameters in the range of 0.01-1 .mu.m, and a ferromagnetic material deposited uniformly in a columnar form on the projections. The recording medium is produced by providing in advance fine projections, the heights and diameters of which are 0.01-10 .mu.m and 0.01-1 .mu.m respectively, on the surface of a substrate to a density of 5.times.10.sup.5 -5.times.10.sup.9 projections per mm.sup.2, and then causing a ferromagnetic material to deposit on the substrate from a vapor phase in such a way that the deposited material is preferentially allowed to adhere onto the projections and then to grow the ferromagnetic material in a direction perpendicular to the plane of the substrate. The present invention has expanded the ranges of usable substrate-forming materials and recording materials, i.e., ferromagnetic materials, and has also simplified the production process.

REFERENCES:
patent: 4348446 (1982-09-01), Mitsuishi et al.
patent: 4396643 (1983-08-01), Kuehn et al.
patent: 4521481 (1985-06-01), Nagao et al.
patent: 4540618 (1985-09-01), Suzuki et al.
patent: 4568600 (1986-02-01), Ono et al.
patent: 4578729 (1986-03-01), Suzuki et al.
patent: 4584078 (1986-04-01), Nakanouchi et al.
Oya et al., Jpn. J. Appl. Phys., vol. 21 (1982), No. 3, pp. 554-555.
Wehner, Advances in Electronics and Electron Physics, vol. 7 (1955), pp. 274-277.
Guentherschulze et al., Z. Physik, vol. 119 (1942), pp. 685-695.
Kirk-Othmer Encyclopedia of Chemical Technology, 3rd Edition (1983), vol. 19, pp. 36-37.

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