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

1986-07-24

1988-10-11

Lesmes, George F.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including variation in thickness

29603, 20419222, 360110, 360122, 427129, 428163, 428472, 4284722, 428694, 428900, G11B 542

Patent

active

047770740

ABSTRACT:
A grooved magnetic substrate including an alumina film layer having a Knoop 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 NiZn 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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