Metal working – Method of mechanical manufacture – Electrical device making
Patent
1997-04-04
1999-11-30
Hall, Carl E.
Metal working
Method of mechanical manufacture
Electrical device making
2960315, 427131, 360113, G11B 542
Patent
active
059920041
ABSTRACT:
A longitudinal bias layer and an electrode layer are formed on a non-magnetic material layer. The longitudinal bias layer and the electrode layer are partially removed by an etching technique so that a narrow gap defining the track width Tw is formed in the longitudinal bias layer and the electrode layer. Furthermore, a three-layer film consisting of, from bottom to top, a magnetoresistance effect layer, a non-magnetic layer, and a transverse bias layer, or otherwise a spin valve film consisting of a free magnetic layer, a non-magnetic layer, a fixed magnetic layer and a bias layer is formed on the above structure. The three-layer film or the spin valve film is then partially removed by an etching technique so that the three-layer film or the spin valve film remains only in the above-described narrow gap formed in the longitudinal bias layer and the electrode layer. The shape of the side walls of the three-layer film or the spin valve film is precisely determined by the side walls of the longitudinal bias layer and the electrode layer. The resultant three-layer film or the spin valve film exhibits excellent magnetic detection characteristics. Furthermore, the longitudinal bias layer has good magnetic coupling with the magnetoresistance effect layer.
REFERENCES:
patent: 5018037 (1991-05-01), Krounbi et al.
patent: 5315468 (1994-05-01), Lin et al.
Kakihara Yoshihiko
Kuriyama Toshihiro
Saito Masamichi
Sato Kiyoshi
Watanabe Toshinori
Alps Electric Co. ,Ltd.
Hall Carl E.
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