Magnetic head for perpendicular magnetic recording

Details Magnetic head for perpendicular magnetic recording Magnetic head for perpendicular magnetic recording

1985-11-20

1987-09-22

Robinson, Ellis P.

Stock material or miscellaneous articles

Self-sustaining carbon mass or layer with impregnant or...

360119, 360120, 360121, 360125, 360135, 427131, 427132, 4284735, 4284744, 428447, 428694, 428900, 428329, G11B 5235

Patent

active

046955127

ABSTRACT:
A magnetic head for perpendicular magnetic recording includes a pair of substrates consituted by a non-magnetic material and having their opposing surfaces respectively formed with heat-resistant polymer films. A thin magnetic film is retained between these substrates. Further, a non-magnetic intermediate film is interposed between the thin magnetic film and each of the polymer films. The intermediate film has a coefficient of thermal expansion which is close to that of the thin magnetic film. Accordingly, no internal stress is generated in the thin magnetic film which would otherwise be caused by thermal expansion and shrinkage in manufacture. Thus, it is possible for the magnetic head to possess sufficiently high wear resistance and excellent magnetic properties.

REFERENCES:
patent: 3079467 (1963-02-01), Rettinger
patent: 3480935 (1969-11-01), Springer
patent: 3544982 (1970-12-01), Hanak
patent: 3578920 (1971-05-01), Okamoto
patent: 3656229 (1972-04-01), Sakurai
patent: 4182643 (1980-01-01), Calderon
patent: 4368496 (1983-01-01), Kato
patent: 4398229 (1983-08-01), McClure
patent: 4589043 (1986-05-01), Grundtner
patent: 4608293 (1986-08-01), Wada
P. A. Albert et al., "Free-Standing Magnetic Films on Thin, Flexible Insulating Layers", IBM Tech. Disclo. Bulletin, vol. 14(5), (Oct. 1971).

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