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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.:

US 7056606 B1

PDFFull Text
Date of Patent:
Jun. 06, 2006

Filed:

Feb. 20, 2004

Magnetic recording medium, method manufacture therefor, and apparatus for magnetic reproducing and reproducing recordings

Applicants:

Kenji Shimizu, Ichihara, JP;

Akira Sakawaki, Ichihara, JP;

Hiroshi Sakai, Ichihara, JP;

Takashi Hikosaka, Tokyo, JP;

Soichi Oikawa, Kawasaki, JP;

Inventors:

Kenji Shimizu, Ichihara, JP;

Akira Sakawaki, Ichihara, JP;

Hiroshi Sakai, Ichihara, JP;

Takashi Hikosaka, Tokyo, JP;

Soichi Oikawa, Kawasaki, JP;

Assignees:

Showa Denko K.K., Tokyo, JP;

Kabushiki Kaisha Toshiba, Tokyo, JP;

Attorney:

Sughrue Mion, PLLC

Primary Examiner:

Stevan A Resan

Assistant Examiner:

Louis Falasco

Int. Cl.
CPC ...
G11B 5/65 (2006.01);
U.S. Cl.
CPC ...
Abstract

A magnetic recording medium comprising: on a non-magnetic substrate, at least a soft magnetic undercoat film comprising a soft magnetic material; an orientation control film for controlling an orientation of a film directly above; a perpendicular magnetic film in which an axis of easy magnetization is oriented mainly perpendicularly with respect to the substrate; and a protection film, wherein the perpendicular magnetic film has a structure in which a large number of magnetic grains are separated by a grain boundary layer, and an average separating distance between the magnetic grains along a straight line which connects centers of gravity of mutually neighboring magnetic grains is 1 nm or greater.

Find Patent Forward Citations

Shimizu, Kenji. (2006). Magnetic recording medium, method manufacture therefor, and apparatus for magnetic reproducing and reproducing recordings (U.S. Patent No. 7056606). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/7056606

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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