Thin-film magnetic head for reading magnetic information on...

Details Thin-film magnetic head for reading magnetic information on... Thin-film magnetic head for reading magnetic information on...

2006-10-17

2006-10-17

Davis, David (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Magnetoresistive reproducing head

Reexamination Certificate

active

07123451

ABSTRACT:
The thin-film magnetic head of the present invention is provided with an antiferromagnetic layer, a pinned layer whose direction of magnetization is fixed by exchange-coupling with the antiferromagnetic layer, a free layer whose direction of magnetization varies according to external magnetic field, an intermediate layer disposed between the pinned layer and free layer, and a pair of electrode layers for supplying a sense current in a layer thickness direction of the free layer. One electrode layer is connected to the pinned layer. Due to this configuration, a sense current flows through the free layer, the intermediate layer, and the pinned layer, but basically does not flow through the antiferromagnetic layer. As a consequence, the antiferromagnetic layer does not contribute to total resistance of the magnetoresistance element, allowing a high magnetoresistance ratio to be obtained.

REFERENCES:
patent: 5701223 (1997-12-01), Fontana et al.
patent: 5715121 (1998-02-01), Sakakima et al.
patent: 6198609 (2001-03-01), Barr et al.
patent: 6219212 (2001-04-01), Gill et al.
patent: 6833979 (2004-12-01), Knapp et al.
patent: 6836392 (2004-12-01), Carey et al.
patent: A 2000-105912 (2000-04-01), None

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