Dynamic magnetic information storage or retrieval – Head – Hall effect
Patent
1992-11-06
1994-02-15
Tupper, Robert S.
Dynamic magnetic information storage or retrieval
Head
Hall effect
338 32R, 32420721, 324252, G11B 539
Patent
active
052872386
ABSTRACT:
A magnetoresistive read sensor based on the spin valve effect and having a multilayered, dual spin valve structure is described. The sensor read element includes first, second and third layers of ferromagnetic material separated from each other by layers of non-magnetic metallic material. The first and third layers of ferromagnetic material, i.e., the outer layers of the structure, have their magnetization orientation fixed, while the second, intermediate ferromagnetic layer is magnetically soft and has its magnetization oriented perpendicular to that of both the outer ferromagnetic layers in the absence of an applied magnetic field. In one preferred embodiment, the two outer ferromagnetic layers have their magnetizations fixed parallel to each other by exchange coupling with adjacent antiferromagnetic layers.
REFERENCES:
patent: 4949039 (1990-08-01), Grunberg
patent: 5134533 (1992-07-01), Friedrich et al.
patent: 5159513 (1992-10-01), Dieny et al.
patent: 5206590 (1993-04-01), Dieny et al.
patent: 5243316 (1993-09-01), Sakakima et al.
patent: 5251088 (1993-10-01), Coutellier et al.
"Giant MR: A Primer", White, IEEE Trans. on Magnetics, vol. 28, No. 5, Sep. 1992 pp. 2482-2486.
Thompson, "Thin Film Magnetoresistors in Memory, Storage, and Related Applications", Jul. 1975, TEEE Transactions On Magnetics Mag.-11, No. 4, pp. 1039-1050.
Baumgart Peter M.
Dieny Bernard
Gurney Bruce A.
Nozieres Jean-Pierre
Speriosu Virgil S.
International Business Machines - Corporation
Murray Leslie G.
Tupper Robert S.
LandOfFree
Dual spin valve magnetoresistive sensor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Dual spin valve magnetoresistive sensor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dual spin valve magnetoresistive sensor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1211835