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:
Jul. 22, 2014
Filed:
May. 15, 2012
Hideki Mashima, Kanagawa, JP;
Nobuo Yoshida, Kanagawa, JP;
Takahiro Ibusuki, Tokyo, JP;
Tsutomu Yasuda, Kanagawa, JP;
Hideki Mashima, Kanagawa, JP;
Nobuo Yoshida, Kanagawa, JP;
Takahiro Ibusuki, Tokyo, JP;
Tsutomu Yasuda, Kanagawa, JP;
HGST Netherlands B.V., Amsterdam, NL;
Abstract
A magnetic sensor having reduced read gap thickness, reduced signal noise and improved signal to noise ratio. The sensor includes a sensor stack and hard bias structures formed at either side of the sensor stack for biasing the free layer of the sensor. A protective layer is formed over a portion of the hard bias structure, however a portion of the hard bias structure extends upward toward the upper shield and is disposed between the protective layer and the sensor stack as a result of the process used to form the magnetic bias structure. This portion of the hard bias structure that extends toward the upper shield has a reduced magnetization relative to the rest of the hard bias structure so that it will not magnetically couple with the upper shield.