Read sensor stabilized by bidirectional anisotropy

Details Read sensor stabilized by bidirectional anisotropy Read sensor stabilized by bidirectional anisotropy

2006-03-15

2009-10-20

Blouin, Mark (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Magnetoresistive reproducing head

Reexamination Certificate

active

07606009

ABSTRACT:
A read sensor stabilized by bidirectional anisotropy is disclosed. The read sensor includes a longitudinal flux-closure structure comprising an antiferromagnetic pinning layer, a ferromagnetic bias layer, a nonmagnetic spacer layer, and a ferromagnetic sense layer. In this longitudinal flux-closure structure, the antiferromagnetic pinning layer directly couples to the ferromagnetic bias layer inducing strong unidirectional anisotropy, and also indirectly couples to the ferromagnetic sense layer inducing weak unidirectional anisotropy. In addition, the ferromagnetic bias layer antiparallel-couples to the ferromagnetic sense layer across the nonmagnetic spacer layer inducing optimal bidirectional anisotropy. The magnetization of the ferromagnetic bias layer thus remains rigidly pinned mainly due to the strong unidirectional anisotropy, while the magnetization of the ferromagnetic sense layer can rotate freely and stably due to the optimal bidirectional anisotropy.

REFERENCES:
patent: 6847509 (2005-01-01), Yoshikawa et al.
patent: 6881496 (2005-04-01), Okamoto
patent: 6888706 (2005-05-01), Ooshima
patent: 6893734 (2005-05-01), Hasegawa et al.
patent: 6893740 (2005-05-01), Saito
patent: 6901652 (2005-06-01), Hasegawa et al.
patent: 6927950 (2005-08-01), Ito et al.
patent: 6947263 (2005-09-01), Saito
patent: 7242556 (2007-07-01), Gill
patent: 7397637 (2008-07-01), Gill
patent: 7423849 (2008-09-01), Gill
patent: 2002/0075609 (2002-06-01), Terunuma
patent: 2002/0191451 (2002-12-01), Kishi et al.
patent: 2003/0072111 (2003-04-01), Hasegawa et al.
patent: 2003/0193760 (2003-10-01), Sakaguci et al.
patent: 2003/0197987 (2003-10-01), Saito
patent: 2003/0218836 (2003-11-01), Shimazawa et al.
patent: 2003/0231436 (2003-12-01), Nishiyama
patent: 2004/0058197 (2004-03-01), Nakamura et al.
patent: 2004/0072020 (2004-04-01), Hasegawa et al.
patent: 2004/0100737 (2004-05-01), Nakamoto et al.
patent: 2004/0207960 (2004-10-01), Saito et al.
patent: 2005/0028352 (2005-02-01), Shimazawa et al.
patent: 2005/0207072 (2005-09-01), Matsuzaka et al.
patent: 2005/0280957 (2005-12-01), Gill
patent: 2006/0044708 (2006-03-01), Gill
patent: 2007/0047153 (2007-03-01), Zeltser
patent: 2007/0064350 (2007-03-01), Gill

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