Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate
2008-04-22
2008-04-22
Kim, Paul (Department: 3729)
Metal working
Method of mechanical manufacture
Electrical device making
C029S603130, C029S603140, C029S603180, C216S062000, C216S065000, C216S066000, C360S122000, C360S125330, C360S317000, C428S692100, C428S690000
Reexamination Certificate
active
07360300
ABSTRACT:
A magnetoresistive sensor having a hard magnetic pinning layer with an engineered magnetic anisotropy in a direction substantially perpendicular to the medium facing surface. The hard magnetic pinning layer may be constructed of CoPt, CoPtCr, or some other magnetic material and is deposited over an underlayer that has been ion beam etched. The ion beam etch has been performed at an angle with respect to normal in order to induce anisotropic roughness for example in form of oriented ripples or facets oriented along a direction parallel to the medium facing surface. The anisotropic roughness induces a strong uniaxial magnetic anisotropy substantially perpendicular to the medium facing surface in the hard magnetic pinning layer deposited there over.
REFERENCES:
patent: 3943047 (1976-03-01), Cruzan et al.
patent: 4309267 (1982-01-01), Boyd et al.
patent: 5143794 (1992-09-01), Suzuki et al.
patent: 5759682 (1998-06-01), Ouchi et al.
patent: 5815343 (1998-09-01), Ishikawa et al.
patent: 6007623 (1999-12-01), Thiele et al.
patent: 6086974 (2000-07-01), Thiele et al.
patent: 6169303 (2001-01-01), Anthony
patent: 6331364 (2001-12-01), Baglin et al.
patent: 6735850 (2004-05-01), Gibbons et al.
patent: 6743529 (2004-06-01), Saito et al.
patent: 7248445 (2007-07-01), Nishiyama
patent: 2002/0051328 (2002-05-01), Hasegawa
patent: 2003/0053265 (2003-03-01), Terunuma et al.
D. Sekiba, R. Moroni, G. Gonella, F. Buatier de Mongeot, C. Boragno, L. Mattera, and U. Valbusa, “Uniaxial magnetic anisotropy tuned by nanoscale ripple formation: Ion-sculpting of Co/Cu(001) thin films,” Applied Physics Letters, vol. 84 No. 5, Feb. 2004.
Dr. Chen Yunjie, “Highly Oriented Media for High Density Magnetic Recording,” Storage Unlimited, Jul.-Sep. 2004.
S. Rusponi, G. Costantini, F. Buatier de Mongeot, C. Boragno, and U. Valbusa, “Patterning a surface on the nanometric scale by ion sputtering,” Applied Physics Letters, vol. 75 No. 21, Nov. 1999.
J.E. Lee, Y. Roh, S.C. Oh, H.-J. Kim, Y.K. Ha, J.S. Bae, I.G. Baek, S.O. Park, U.-I. Chung, and J.T. Moon, “Improved Magnetic Tunnel Junction With Amorphous Seed Layer, Surface Treatment, and High-Polarization Magnetic Materials,” IEEE Transactions on Magnetics, vol. 40, No. 4, Jul. 2004.
Jan-Ulrich Thiele, M.E. Best, M.F. Toney, D. Weller, “Grain Size Control in FePt Thin Films by Ar-Ion Etched Pt Seed Layers,” IEEE Transactions on Magnetics, vol. 37, No. 4, Jul. 2001.
M. Takahashi, H. Shoji, D. D. Djayaprawira, and S. Yoshimura, “Novel Sputtering Process to Reduce the Grain Size and its Distribution in Co-Based Longitudinal Thin Film Media—New Seedlayer and High KuGrainMaterial,” IEEE Transactions on Magnetics, vol. 36, No. 5, Sep. 2000.
T.C. Arnoldussen, E.M. Rossi, A. Ting, A. Brunsch, J. Schneider, and G. Trippel, “Obliquely Evaporated Iron-Cobalt and Iron-Cobalt-Chromium Thin Film Recording Media,” IEEE Transactions on Magnetics, vol. 20, No. 5, Sep. 1984.
M.J. Hadley and R.J. Pollard, “Magnetic and Structural Properties of Co Films Deposited onto Obliquely Sputtered Pt Underlayers,” Journal of Applied Physics, vol. 92, No. 12, Dec. 2002.
J.F. Whitacre, Z.U, Rek, J.C. Billello and S.M. Yalisove, “Surface Roughness and In-Plane Texturing in Sputtered Thin Films,” Journal of Applied Physics, vol. 84, No. 3, Aug. 1998.
R. Moroni, D. Sekiba, F. Buatier de Mongeot, G. Gonella, C. Boragno, L. Mattera, and U. Valbusa, “Uniaxial Magnetic Anisotropy in Nanostructured Co/Cu(001): From Surface Ripples To Nanowires,” Physical Review Letters, vol. 91, No. 16, Oct. 2003.
Carey Matthew Joseph
Childress Jeffrey Robinson
Fullerton Eric Edward
Maat Stefan
Hitachi Global Storage Technologies - Netherlands B.V.
Kim Paul
Zilka-Kotab, PC
LandOfFree
Method for manufacturing a magnetic read sensor employing... 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 for manufacturing a magnetic read sensor employing..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for manufacturing a magnetic read sensor employing... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2791285