Dynamic magnetic information storage or retrieval – Head – Hall effect
Patent
1995-06-07
1997-10-21
Wolff, John H.
Dynamic magnetic information storage or retrieval
Head
Hall effect
G11B 533
Patent
active
056802811
ABSTRACT:
A magnetoresistive (MR) sensor comprising a layer of ferromagnetic material forming an MR sensing element wherein the MR sensor is biased by utilizing only the MR stripe uniaxial anisotropy and the shape anisotropy of the active region of the sensing element. The active region of the MR element has a generally square geometry to provide the desired shape anisotropy. The MR sensor is biased at approximately 45 degrees by defining the magnetization at the four edges of the sense element active region utilizing its shape anisotropy and canting the magnetic easy axis at an appropriate angle during fabrication of the MR sensor. To minimize Barkhausen noise, a single magnetic domain configuration is achieved by reducing the sensor active region dimensions, i.e., stripe height and track width, to less than the characteristic domain wall thickness such that the formation of multiple magnetic domains is no longer energetically favorable. A magnetic biasing material such as a layer of antiferromagnetic material to provide exchange coupling, can be provided at a pair of opposing edges to maintain the magnetization at the edges in the desired orientation and to stabilize the sensor.
REFERENCES:
patent: 4103315 (1978-07-01), Hempstead et al.
patent: 4663683 (1987-05-01), Youda et al.
patent: 4663685 (1987-05-01), Tsang
patent: 4785366 (1988-11-01), Krounbi et al.
patent: 4841398 (1989-06-01), Mowry
patent: 5159513 (1992-10-01), Dieny et al.
patent: 5287238 (1994-02-01), Baumgart et al.
patent: 5325253 (1994-06-01), Chen et al.
patent: 5343422 (1994-08-01), Kung et al.
patent: 5380548 (1995-01-01), Lin et al.
IEEE Trans. on Magnetics, vol. MAG16, No. 5, Sep. 1980, Decker et al, pp. 643-645.
C. Tsang, "Magnetics of small magnetoresistive sensors", J. Appl. Phys. 55(6), Mar. 1984, pp. 2226-2231.
Kung Kenneth Ting-Yuan
Wang Po-Kang
International Business Machines - Corporation
Murray Leslie G.
Ometz David L.
Saber Paik
Wolff John H.
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