Dynamic magnetic information storage or retrieval – Head – Gap spacer
Reexamination Certificate
2005-12-13
2005-12-13
Klimowicz, William J (Department: 2652)
Dynamic magnetic information storage or retrieval
Head
Gap spacer
C360S121000
Reexamination Certificate
active
06975485
ABSTRACT:
A thin film inductive write head for magnetic recording has a write gap formed as a lamination of alternating layers of a nonmagnetic gap layer and a ferromagnetic spacer layer. There are N gap layers and N−1 spacer layers, with each pole tip of the write head being located adjacent to a gap layer. The spacer layers in the gap structure are formed of a ferromagnetic material with a high saturation moment density (BS) that is close to the BSof the spacer material from which the pole tips are formed. Unlike the pole tips, the spacer layers are not part of a magnetic circuit and are magnetically isolated, i.e., completely surrounded by nonmagnetic gap material. The effect of the spacer layers is to effectively divide the gap into a plurality of smaller gaps. The write head with the laminated gap creates a write bubble that is narrower in the off-track direction and wider in the in-track direction.
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Hsu Yimin
Tsang Ching Hwa
Berthold Thomas R.
International Business Machines - Corporation
Johnson Daniel E.
Klimowicz William J
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