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:
Sep. 18, 2012
Filed:
Feb. 04, 2009
Masato Shiimoto, Odawara, JP;
Takeshi Nakagawa, Odawara, JP;
Hiroyuki Katada, Odawara, JP;
Naoto Ito, Fujisawa, JP;
Kenichi Meguro, Kaisei, JP;
Masato Shiimoto, Odawara, JP;
Takeshi Nakagawa, Odawara, JP;
Hiroyuki Katada, Odawara, JP;
Naoto Ito, Fujisawa, JP;
Kenichi Meguro, Kaisei, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A magnetic recording read head is provided capable of achieving high reproduction output, resolution, and SNR, even at a high linear density. There is also provided a magnetic recording and reproducing device capable of achieving sufficient error bit rate. The magnetic recording read head includes a differential read head and a write head. The differential read head has a multilayer structure formed by laminating a first magnetoresistive sensor having a first free layer, a differential gap layer, and a second magnetoresistive sensor having a second free layer. Outside the multilayer structure, a pair of electrodes and a pair of magnetic shields are provided respectively. A ratio (Gl/bl) of an inside distance (Gl) between the first and second free layers to a bit length (bl) is set to 0.6 or more and 1.6 or less.