Dynamic magnetic information storage or retrieval – Head – Core
Reexamination Certificate
2005-06-14
2005-06-14
Letscher, George (Department: 2653)
Dynamic magnetic information storage or retrieval
Head
Core
C360S123090, C360S125020, C360S317000, C029S603080, C029S603140
Reexamination Certificate
active
06906894
ABSTRACT:
A read/write head and method of making the same are used in a data storage system, such as a disk drive, for perpendicular magnetic recording of data. The head employs a two-layer pole design with a main pole made of sputtered high moment magnetic material, and an adjunct pole made of electroplated soft magnetic film. The main pole is used to write data onto the medium, and is formed over the write coil. The adjunct pole is substantially recessed from the air bearing surface and is formed over the main pole. The present head design significantly enhances the magnetic write field, and substantially reduces side-writing that result in accidental erasure of data in adjacent tracks on the magnetic recording medium.
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patent: 6466401 (2002-10-01), Hong et al.
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Chen Yingjian
Dang Xiaozhong
Jiang Hai
Liu Francis H.
Shi Xizeng
Kassatly, Esq. Samuel A.
Letscher George
Western Digital (Fremont) Inc.
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