Dynamic magnetic information storage or retrieval – Head – Magnetoresistive reproducing head
Reexamination Certificate
2005-10-06
2009-12-29
Blouin, Mark (Department: 2627)
Dynamic magnetic information storage or retrieval
Head
Magnetoresistive reproducing head
Reexamination Certificate
active
07639456
ABSTRACT:
A current perpendicular to plane (CPP) sensor and method of manufacturing such a sensor that prevents current shunting at the sides of the barrier/spacer layer due to redeposited material. A first ion mill is performed to remove at least the free layer. A quick glancing ion mill can be performed to remove the small amount of redep that may have accumulated on the sides of the free layer and barrier/spacer layer. Then an insulation layer is deposited to protect the sides of the free layer/barrier layer during subsequent manufacturing which can include further ion milling to define the rest of the sensor and another glancing ion mill to remove the redep formed by the further ion milling. This results in a sensor having no current shunting at the sides of the sensor and having no damage to the sensor layers.
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Chinese Office Action Summary from application No. 2006/10131732.X Issued on Oct. 10, 2008.
Hong Ying
Jayasekara Wipul Pemsiri
Blouin Mark
Hitachi Global Storage Technologies - Netherlands B.V.
Zilka-Kotab, PC
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