The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 08, 2011
Filed:
Jul. 20, 2007
Yusuke Toma, Niigata-ken, JP;
Hiroshi Kameda, Niigata-ken, JP;
Kiyoshi Kobayashi, Niigata-ken, JP;
Toru Takahashi, Niigata-ken, JP;
Sumihito Morita, Niigata-ken, JP;
Toshinori Watanabe, Niigata-ken, JP;
Yusuke Toma, Niigata-ken, JP;
Hiroshi Kameda, Niigata-ken, JP;
Kiyoshi Kobayashi, Niigata-ken, JP;
Toru Takahashi, Niigata-ken, JP;
Sumihito Morita, Niigata-ken, JP;
Toshinori Watanabe, Niigata-ken, JP;
TDK Corporation, Tokyo, JP;
Abstract
A perpendicular magnetic recording head includes a first magnetic layer having a main magnetic pole exposed at a medium-facing surface that faces a recording medium; a second magnetic layer that faces the first magnetic layer with a nonmagnetic layer interposed therebetween; and a coil layer for applying a recording magnetic field to the first magnetic layer. The second magnetic layer includes a relatively thick edge portion, whereby the edge-write magnetic field is reduced and the external magnetic field resistance is increased.