Dynamic magnetic information storage or retrieval – Head – Core
Reexamination Certificate
2008-08-28
2011-11-22
Watko, Julie Anne (Department: 2627)
Dynamic magnetic information storage or retrieval
Head
Core
C360S125120, C029S603140, C029S603230
Reexamination Certificate
active
08064161
ABSTRACT:
Embodiments of the present invention help to provide a perpendicular magnetic recording head capable of writing a signal in a track having a small width. According to one embodiment, a perpendicular magnetic recording head includes an auxiliary pole, a main pole, a yoke, a coil, a first soft magnetic film and a second soft magnetic film. The yoke is in contact with the main pole. The coil is wound around a magnetic circuit composed of the auxiliary and main poles and the yoke. The first soft magnetic film is provided on both sides of the main pole with a non-magnetic film provided between the first soft magnetic film and the main pole. The second soft magnetic film is provided on the trailing side of the main pole with the non-magnetic film provided between the second soft magnetic film and the main pole. The first and second soft magnetic films are two types of plated magnetic films. One type of the plated magnetic films have respective thicknesses of 0.5 nm to 20 nm and respective body centered cubic lattice crystal structures. The other types of the plated magnetic films have respective thicknesses of 0.5 nm to 20 nm and respective face centered cubic lattice crystal structures. The two types of the plated magnetic films are alternately laminated with four or more layers. This can achieve the magnetic disk drive capable of reducing a possibility to erroneously delete a signal after the signal being written and preventing degradation of characteristics of a high frequency signal.
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Kudo Kazue
Maruyama Yohji
Oikawa Gen
Saiki Noriyuki
Shiina Hiromi
Hitachi Global Storage Technologies - Netherlands B.V.
Watko Julie Anne
Zilka-Kotab, PC
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