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. 21, 2010
Filed:
Jun. 30, 2006
Hoon-sang OH, Seongnam-si, KR;
Yong-su Kim, Seoul, KR;
No-yeol Park, Seongnam-si, KR;
Hoo-san Lee, Osan-si, KR;
Chul-min Choi, Seoul, KR;
Hoon-sang Oh, Seongnam-si, KR;
Yong-su Kim, Seoul, KR;
No-yeol Park, Seongnam-si, KR;
Hoo-san Lee, Osan-si, KR;
Chul-min Choi, Seoul, KR;
Samsung Electronics Co., Ltd., Suwon-si, KR;
Abstract
A perpendicular magnetic recording medium including a soft magnetic underlayer. The perpendicular magnetic recording medium includes: a lower structural body including an anti-ferromagnetic layer; a first soft magnetic underlayer, a non-magnetic layer, and a second soft magnetic underlayer sequentially formed on the anti-ferromagnetic layer, where the thickness ratio of the second soft magnetic underlayer to that of the first soft magnetic underlayer is designed to be within specific range; and a recording layer formed on the second soft magnetic underlayer. Therefore, noise generated on the soft magnetic underlayer due to external magnetic fields of a magnetic head and a voice coil motor can be reduced greatly.