Magnetic recording apparatus and magnetic recording medium with

Details Magnetic recording apparatus and magnetic recording medium with Magnetic recording apparatus and magnetic recording medium with

1992-04-16

1994-02-22

Miller, Jr., George H.

Recorders

Magnetographic

Physical reorientation of magnetic particles

360131, G11B 900, G11B 574

Patent

active

052892026

ABSTRACT:
A magnetic recording medium having a triple layered structure including a substrate, a first layer or a soft magnetic thin film of high permeability piled on the substrate, a second layer or a vertical magnetization film piled on the first layer, a third layer or a soft magnetic film of high permeability piled on the second layer. A magnetic recording apparatus alternately switches the magnetization orientations of the second layer or the vertical magnetization film at a recording location where a latent image is to be formed. The first and third layer or the soft magnetic thin films can improve recording efficiency. The field produced by the second layer or the vertical magnetization film causes the third layer or the soft magnetic thin film to be magnetized along the surface of the magnetic recording medium, and this results in the concentration of the flux owing to switching of the magnetization directions. This enables high density recording and improves recording sensitivity and reproducing sensitivity.

REFERENCES:
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patent: 4371590 (1983-02-01), Izumi et al.
patent: 4628328 (1986-12-01), Takahashi et al.
patent: 4678722 (1987-07-01), Cohen
patent: 4908809 (1990-03-01), Tadokoro et al.
patent: 5016232 (1991-05-01), Tadokoro et al.
"The Fourth International Congress on Advances in Non-impact Printing Technologies", Mar. 20-25, 1988, New Orleans, La., USA, Christine Camelin, pp. 555-562.

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