Method for making magnetic recording media

Details Method for making magnetic recording media Method for making magnetic recording media

1986-05-19

1988-08-30

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

Coating, forming or etching by sputtering

2041922, 20419231, 204298, 427131, 427132, C23C 1436

Patent

active

047675160

ABSTRACT:
A magnetic recording tape making process and apparatus is disclosed. The apparatus includes a first depositing station which utilizes a the sputtering process for depositing a seed layer on a substrate with an initial incident angle of about 5.degree., and a second depositing station for depositing, over the seed layer, an extended layer with an initial incident angle of about 45.degree.. The seed layer has a thickness of about 0.01 micrometer, and is defined by young crystalline columns of magnetic material densely and perpendicularly formed on the substrate. The extended layer is defined by extended crystalline columns over the young crystalline columns through self-epitaxial growth. The completed magnetic film defined by the two layers has a high residual magnetization ratio MV/MH and also a high perpendicular coercivity Hcv.

REFERENCES:
patent: 4511594 (1985-04-01), Yanai et al.
patent: 4547398 (1985-10-01), Sugita et al.
patent: 4567116 (1986-01-01), Sawada et al.
patent: 4576700 (1986-03-01), Kadokura et al.
patent: 4622271 (1986-11-01), Arai et al.
patent: 4663193 (1987-05-01), Endo

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