Read/write head having a GMR sensor biased by permanent magnets

Details Read/write head having a GMR sensor biased by permanent magnets Read/write head having a GMR sensor biased by permanent magnets

1997-08-19

1999-03-16

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Head

Hall effect

G11B 539

Patent

active

058837639

ABSTRACT:
A compact read/write head having a biased giant magnetoresistive sensor. Permanent magnet films are placed adjacent to the giant magnetoresistive sensor operating in the current-perpendicular-to the-plane (Cpp) mode and spaced with respect to the sensor by conducting films. These permanent magnet films provide a magnetic bias. The bias field is substantial and fairly uniform across sensor height. Biasing of the giant magnetoresistive sensor provides distinguishable response to the rising and falling edges of a recorded pulse on an adjacent recording medium, improves the linearity of the response, and helps to reduce noise. This read/write head is much simpler to fabricate and pattern and provides an enhanced uniformity of the bias field throughout the sensor.

REFERENCES:
patent: 5576914 (1996-11-01), Rottmayer et al.

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