Method and apparatus for providing a dual...

Dynamic magnetic information storage or retrieval – Head – Magnetoresistive reproducing head

Reexamination Certificate

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C360S324110

Reexamination Certificate

active

10811525

ABSTRACT:
A method and apparatus for providing a dual current-perpendicular-to-plane (CPP) GMR sensor with improved top pinning is disclosed. In the passive regions of the sensor, a tri-level biasing layer is formed proximate to the top self-pinned layer. The tri-level biasing layer includes a first metal oxide layer, a layer of alpha-Fe2O3and a second metal oxide layer. The pinning of the top self-pinned layer is enhanced by the layer of alpha-Fe2O3. The layer of alpha-Fe2O3pins the top portion of the pinned layer by providing higher coercivity (HC) to the pinned layer.

REFERENCES:
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patent: 6295187 (2001-09-01), Pinarbasi
patent: 6317298 (2001-11-01), Gill
patent: 6680827 (2004-01-01), Li et al.
patent: 6781798 (2004-08-01), Gill
patent: 6866751 (2005-03-01), Gill et al.
patent: 7027268 (2006-04-01), Zhu et al.
patent: 2001/0004798 (2001-06-01), Gill
patent: 2002/0191348 (2002-12-01), Hasegawa et al.
patent: 2003/0086217 (2003-05-01), Pinarbasi

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