Grooved magnetic substrates and method for producing the same

Details Grooved magnetic substrates and method for producing the same Grooved magnetic substrates and method for producing the same

1988-06-29

1989-10-24

Lesmes, George F.

Chemistry: electrical and wave energy

Processes and products

Coating, forming or etching by sputtering

29603, 20419222, 360110, 360122, 427129, 428472, 4284722, 428694, 428900, G11B 542, C23C 1434

Patent

active

048759872

ABSTRACT:
A grooved magnetic substrate including an alumina film layer having a Knopp hardness of 600 kg/mm.sup.2 to 1200 kg/mm.sup.2 charged in at least one groove formed in a surface of a magnetic substrate. The magnetic substrate may be Mn-Zn or Ni--Zn base ferrite. The alumina film layer is formed by sputtering.

REFERENCES:
patent: 4422117 (1983-12-01), Nomura
patent: 4588654 (1986-05-01), Kobuke
patent: 4598052 (1986-07-01), Wada et al.
patent: 4608293 (1986-08-01), Wada
patent: 4656547 (1987-04-01), Kumasaka et al.
patent: 4659606 (1987-04-01), Wada et al.
patent: 4690846 (1987-09-01), Wada et al.

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