Dynamic magnetic information storage or retrieval – Head – Magnetoresistive reproducing head
Reexamination Certificate
2006-05-02
2006-05-02
Castro, Angel (Department: 2653)
Dynamic magnetic information storage or retrieval
Head
Magnetoresistive reproducing head
C029S603140
Reexamination Certificate
active
07038891
ABSTRACT:
A method and apparatus for providing precise control of magnetic coupling field in NiMn top spin valve heads and amplitude enhancement is disclosed. The magnetic coupling between free and pinned layers in NiMn top spin valve heads is precisely controlled by employing the surface oxidation of Cu seed layer or/and Cu spacer layer that improve both the interfacial quality and the crystalline texture. According to the present invention the magnitude of coupling field can be precisely controlled without affecting resistance, and the amplitude of giant magneto-resistive(GMR) heads is improved by 15% at the same coupling field without affecting asymmetry performance. Thus, the present invention improves not only the interfacial roughness, but also improves the magnetic layer texture. The oxidation of Cu seed layer in the NiMn top spin valve structure provides more robust process with good control in coupling field that affects asymmetry of a GMR head.
REFERENCES:
patent: 5432734 (1995-07-01), Kawano et al.
patent: 5738946 (1998-04-01), Iwasaki et al.
patent: 5764056 (1998-06-01), Mao et al.
patent: 5849422 (1998-12-01), Hayashi
patent: 6051304 (2000-04-01), Takahashi
patent: 6452761 (2002-09-01), Carey et al.
patent: 6542342 (2003-04-01), Hayashi et al.
patent: 6700754 (2004-03-01), Kula et al.
patent: 1124273 (2001-08-01), None
patent: 9-161243 (1997-06-01), None
patent: 9-245320 (1997-09-01), None
patent: 9-275233 (1997-10-01), None
patent: 10-256621 (1998-09-01), None
patent: 10-303477 (1998-11-01), None
patent: 11-87803 (1999-03-01), None
Egelhoff, Jr. et al., “Oxygen as a Surfactant in the Growth of Giant Magnetoresistance Spin Valves,” J. Appl. Phys., 82, Dec. 15, 1997, pp. 6142-6151.
Tolkes et al., “Surfactant-Induced Layer-by-Layer Growth on a Highly Anisotropic Substrate: Co/Cu(110),” Physical Review Letters, vol. 80, No. 13, Mar. 30, 1998, pp. 2877-2880.
Geon Choe, “Giant interface magnetostriction and temperature dependence in NiFe films encapsulated with Ta and Al2O3 layers,” IEEE Trans. Mag. vol. 35(5), p. 3838, 1999.
Castro Angel
Chambliss Bahner & Stophel P.C.
International Business Machines - Corporation
Lynch David W.
LandOfFree
Method and apparatus for providing precise control of... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for providing precise control of..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for providing precise control of... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3615331