Magnetic recording medium, method for producing same and magneti

Details Magnetic recording medium, method for producing same and magneti Magnetic recording medium, method for producing same and magneti

1991-11-25

1994-01-18

Wolff, John H.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

360135, G11B 584

Patent

active

052804011

ABSTRACT:
The magnetic recording medium includes a nonmagnetic substrate having different values of surface tension corresponding to surface free energy in a predetermined magnetic recording direction and in the direction substantially perpendicular thereto, a magnetic film epitaxially grown on the nonmagnetic substrate, and a protective film on the magnetic film. The surface of the nonmagnetic substrate is provided with irregular surfaces having gradients of 45 degrees .+-.10 degrees relative to the substrate surface. The magnetic film has a main component of an easy axis of magnetization in the magnetic recording direction. The hydrogen peroxide aqueous solution and nitric acid used for the surface treatment of the substrate affect differently the critical surface tension. The partial nonmetal layer can be partially worked to provide textures extending in the magnetic recording direction. The nonmagnetic substrate and the magnetic film are respectively made of substantially nickel-phosphorus and cobalt, and the partial nonmetal layer is made of carbon.

REFERENCES:
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patent: 4567096 (1986-01-01), Piltingsrud et al.
patent: 4567108 (1986-01-01), Lehner et al.
patent: 4603091 (1986-07-01), Mukasa et al.
patent: 4735840 (1988-04-01), Hedgcoth
patent: 5062021 (1991-10-01), Ranjan et al.
patent: 5082709 (1992-01-01), Suzuki et al.

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