Dynamic magnetic information storage or retrieval – Head – Magnetoresistive reproducing head
Reexamination Certificate
2006-08-29
2006-08-29
Davis, David (Department: 2627)
Dynamic magnetic information storage or retrieval
Head
Magnetoresistive reproducing head
C029S603140
Reexamination Certificate
active
07099125
ABSTRACT:
A problem associated with current bottom spin valve designs is that it is difficult to avoid magnetic charge accumulation at the edge of the sensor area, making a coherent spin rotation during sensing difficult to achieve. This problem has been eliminated by introducing an exchange coupling layer between the free layer and the ferromagnetic layer that is used to achieve longitudinal bias for stabilization and by extending the free layer well beyond the sensor area. After all layers have been deposited, the read gap is formed by etching down as far as this layer. Since it is not critical exactly how much of the biasing layers (antiferromagnetic as well as ferromagnetic) are removed, the etching requirements are greatly relaxed. Whatever material remains in the gap is then oxidized thereby providing a capping layer as well as a good interface for specular reflection in the sensor region.
REFERENCES:
patent: 5637235 (1997-06-01), Kim et al.
patent: 5856897 (1999-01-01), Mauri
patent: 6118624 (2000-09-01), Fukuzawa et al.
patent: 6185079 (2001-02-01), Gill
patent: 6266218 (2001-07-01), Carey et al.
patent: 6313973 (2001-11-01), Fuke et al.
patent: 6671138 (2003-12-01), Noma et al.
patent: 2005/0128649 (2005-06-01), Dovek et al.
S.S.P. Parkin, “Systematic Variation of the Strength and Oscillation Period of Indirect Magnetic Exchange Coupling through the 3d, 4d, and 5d Transition Metals,” Phys. Rev. Let., vol. 67, No. 25, 1991, pp. 3598-3601.
B. Dieng et al., “Giant Magnetoresistance in soft ferromagnetic multilayers,” Phys. Rev. B, vol. 43, No. 1, pp. 1297-1300, 1991.
“Specular Electron Scattering in Giant Magnetoresistance Spin Valves,” by W.F. Egelhoff, Jr. et al., IEEE Trans. on Magnetics, vol. 33, No. 5, Sep. 1997, pp. 3580-3582.
Han Cherng Chyi
Li Yun-Fei
Torng Chyu-Jiuh
Wang Hui-Chuan
Ackerman Stephen B.
Davis David
Headway Technologies Inc.
Saile Ackerman LLC
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