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:
Dec. 27, 2011
Filed:
Jul. 25, 2006
Susumu Soeya, Tokyo, JP;
Susumu Soeya, Tokyo, JP;
Hitachi Global Storage Technologies Netherlands B.V., Amsterdam, NL;
Abstract
Embodiments of the invention provide a thermally assisted magnetic recording medium, which can overcome resistance against thermal fluctuation at RT and write capability, obtain a drastic temperature variation in coercive force at right below the recording temperature, and be formed at low temperature. In one embodiment, the medium has a layered structure formed of a lower high-KF ferromagnetic (F) layer formed on a substrate, satisfying T<T, an intermediate low-Kantiferromagnetic (AF) layer satisfying T<T, and an upper ferromagnetic (F) layer for recording and reproducing, satisfying T<T, where Tis a recording temperature, Tis a Curie point, Tis a Neel point, Tis a blocking temperature, Kis a ferromagnetic magnetocrystalline anisotropy constant, and Kis an antiferromagnetic magnetocrystalline anisotropy constant.