Dynamic magnetic information storage or retrieval – Head – Hall effect
Patent
1997-06-19
1998-06-16
Heinz, A. T.
Dynamic magnetic information storage or retrieval
Head
Hall effect
G11B 539
Patent
active
057680710
ABSTRACT:
A multilayered spin valve read head including an antiferromagnetic pinning layer and a ferromagnetic pinned layer which can maintain a high pinning field between the layers while minimizing the coercivity of the pinning layer. The apparatus and method of the invention comprise placing a thin discontinuous nonmagnetic interlayer such as Cu between the antiferromagnetic and the ferromagnetic layers. In one aspect, the invention comprises a supporting substrate or carrier; a first layer of antiferromagnetic material formed over the substrate; a second layer comprising a discontinuous nonmagnetic material formed over the antiferromagnetic first layer; a third layer comprising a ferromagnetic material formed over the discontinuous nonmagnetic material second layer, the first and third layer exhibiting exchange anisotropy which fixes the direction of magnetization of the third layer; a fourth layer comprising a nonmagnetic material formed over the ferromagnetic third layer; and, a fifth layer comprising a ferromagnetic material formed over the nonmagnetic fourth layer.
REFERENCES:
patent: 5206590 (1993-04-01), Dieny et al.
patent: 5301079 (1994-04-01), Cain et al.
patent: 5343422 (1994-08-01), Kung et al.
patent: 5373238 (1994-12-01), McGuire et al.
patent: 5408377 (1995-04-01), Gurney et al.
patent: 5422571 (1995-06-01), Gurney et al.
patent: 5442508 (1995-08-01), Smith
patent: 5465185 (1995-11-01), Heim et al.
patent: 5475304 (1995-12-01), Prinz
patent: 5668688 (1997-09-01), Dykes
Hamakawa et al., "Spin-Valve Heads Utilizing Antiferromagnetic NiO Layers", IEEE Transactions on Magnetics, 32:1, pp. 149-155, Jan. 1996.
Soeya et al., "Distribution of Blocking Temperature in Bilayered Ni.sub.81 Fe.sub.19 /NiO Films", J. Appl. Phys. 76:(9) pp. 5356-5360, 1 Nov. 1994.
Tan et al., "Exchange Coupling of Sputter Deposited NiCo-O/NiFe Thin Films", J. Appl. Phys. 79:(8) pp. 5012-5014, 15 Apr. 1996.
Heinz A. T.
International Business Machines - Corporation
LandOfFree
Spin valve sensor with improved magnetic stability of the pinned does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Spin valve sensor with improved magnetic stability of the pinned, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spin valve sensor with improved magnetic stability of the pinned will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1732893