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:
Apr. 09, 2013
Filed:
Dec. 22, 2006
Hoo San Lee, Osan-si, KR;
Hoon Sang OH, Seongnam-si, KR;
Sok Hyun Kong, Seoul, KR;
Seong Yong Yoon, Suwon-si, KR;
Hoo San Lee, Osan-si, KR;
Hoon Sang Oh, Seongnam-si, KR;
Sok Hyun Kong, Seoul, KR;
Seong Yong Yoon, Suwon-si, KR;
Seagate Technology LLC, Cupertino, CA (US);
Abstract
A perpendicular magnetic recording medium is provided. The perpendicular magnetic recording medium includes: a perpendicular magnetic recording layer formed on a substrate; and at least one soft magnetic under-layer formed between the substrate and the perpendicular magnetic recording layer, wherein the soft magnetic under-layer is made from an alloy of a non-magnetic material and a magnetic material which exists in the form of granular nanoparticles in matrix of the non-magnetic material, and at least two of the magnetic nanoparticles are spaced apart from one another by a predetermined distance so as to mutually make an anti-ferromagnetic coupling.