Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate
2007-07-03
2007-07-03
Kim, Paul D. (Department: 3729)
Metal working
Method of mechanical manufacture
Electrical device making
C029S603140, C029S603150, C029S603160, C029S603180, C029S603200, C216S022000, C216S039000, C216S041000, C216S048000, C360S324110, C360S324120, C360S320000, C360S321000, C360S324200, C427S127000, C427S128000
Reexamination Certificate
active
10976661
ABSTRACT:
A method for making a tunnel valve head with a flux guide. The tunnel valve sensor is created by forming a tunnel valve at a first shield layer. The tunnel valve includes a free layer distal to the first shield layer, a first insulation layer deposited over the first shield layer and around the tunnel valve, a flux guide formed over the first insulation layer and coupling to the tunnel valve at the free layer, a second insulation layer formed over the flux guide and a second shield layer formed over the second insulation layer. The flux guide and the free layer are physically isolated by the first and second insulation layers to prevent current shunts therefrom. The structure achieves physical connection between the flux guide and the free layer and insulates the flux guide from the shields.
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“Evaluation of front flux guide-type magnetic tunnel junction heads”; Shimazawa, K.; Redon, O.; Kasahara, N.; Sun, J.J.; Sato, K.; Kagami, T.; Saruki, S.; Umehara, T.; Fujita, Y.; Yarimizu, S.; Araki, S.; Morita, H.; Matsuzaki, M.; Magnetics, IEEE Transactions on vol. 36, Issue 5, Part 1; Sep. 2000; pp. 2542-2544.
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Chambliss Bahner & Stophel PC
Hitachi Global Storage Technologies - Netherlands B.V.
Kim Paul D.
Lynch David W.
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