Magnetic head with yoke and multiple magnetic layers

Dynamic magnetic information storage or retrieval – Head – Magnetoresistive reproducing head

Reexamination Certificate

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Details

C360S324200

Reexamination Certificate

active

07012790

ABSTRACT:
The present invention provides a magnetic head having improved characteristics, using a magnetoresistive device in which current flows across the film plane such as a TMR device. In a first magnetic head of the present invention, when the area of a non-magnetic layer is defined as a device cross-section area, and the area of a yoke is defined as a yoke area, viewed along the direction perpendicular to the surface of the substrate over which the yoke and the magnetoresistive device are formed, then the device cross-section area is not less than 30% of the yoke area, so that a resistance increase of the device cross-section area is suppressed. In a second magnetic head of the present invention, a magnetoresistive device is formed on a substrate, and a yoke is provided above a non-magnetic layer constituting the device. In a third magnetic head of the present invention, the free layer of the magnetoresistive device includes at least two magnetic films and at least one non-magnetic film that are laminated alternately, and the thickness of the non-magnetic layer is not less than 2 nm and not more than 10 nm, and magnetostatic coupling is dominant. In a fourth magnetic head of the present invention, a magnetic gap is provided adjacent to the magnetoresistive device and the magnetic films are coupled antiferromagnetically.

REFERENCES:
patent: 5898547 (1999-04-01), Fontana, Jr. et al.
patent: 5909344 (1999-06-01), Gill
patent: 5930087 (1999-07-01), Brug et al.
patent: 6046891 (2000-04-01), Yoda et al.
patent: 6064552 (2000-05-01), Iwasaki et al.
patent: 6134078 (2000-10-01), Suzuki
patent: 6239955 (2001-05-01), Dovek et al.
patent: 6307708 (2001-10-01), Yoda et al.
patent: 6369992 (2002-04-01), Yoda et al.
patent: 6473277 (2002-10-01), Gill
patent: 6519124 (2003-02-01), Redon et al.
patent: 6542343 (2003-04-01), Gill
patent: 6567244 (2003-05-01), Gill
patent: 6567246 (2003-05-01), Sakakima et al.
patent: 1 033 764 (2000-09-01), None
patent: 62-172515 (1987-07-01), None
patent: 11-25425 (1999-01-01), None
patent: 11-213349 (1999-08-01), None
patent: 2002-222505 (2002-08-01), None
patent: 99/22368 (1999-05-01), None

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