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:
Jun. 07, 2011
Filed:
May. 30, 2008
Akira Miyatake, Tokyo, JP;
Kiyoshi Kobayashi, Tokyo, JP;
Shuji Maekawa, Tokyo, JP;
Tomoo Otsuka, Tokyo, JP;
Hideyuki Nakano, Tokyo, JP;
Akira Miyatake, Tokyo, JP;
Kiyoshi Kobayashi, Tokyo, JP;
Shuji Maekawa, Tokyo, JP;
Tomoo Otsuka, Tokyo, JP;
Hideyuki Nakano, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
In a perpendicular magnetic recording head comprising a main magnetic pole layer and a return yoke layer which are laminated with a magnetic gap layer interposed therebetween, a nonmagnetic throat height determining layer and a return yoke reinforcement layer made of a magnetic material having a saturated magnetic flux density higher than that of the return yoke layer are provided on the magnetic gap layer. The nonmagnetic throat height determining layer has a front end face parallel to the medium-opposing surface at a position retracted by a desirable throat height from the medium-opposing surface. The return yoke reinforcement layer is formed directly under the return yoke layer so as to extend at least from the front end face of the nonmagnetic throat height determining layer to the upper face thereof, and is exposed at the medium-opposing surface between the magnetic gap layer and return yoke layer.