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:
Mar. 18, 2003
Filed:
Mar. 25, 1999
Sony Corporation, Tokyo, JP;
Abstract
A magnetic recording medium includes an anti-ferromagnetic layer layered on at least one of the opposite major surfaces in a direction along the thickness of a ferromagnetic recording layer It is possible for magnetization in the vicinity of a surface of an anti-ferromagnetic layer facing a ferromagnetic recording layer to be rotated simultaneously with rotation of magnetization of the ferromagnetic recording layer It is also possible for the intensity of exchange coupling between the two layers to be larger than the total magnetic anisotropy of the anti-ferromagnetic layer It is similarly possible for the intensity of the exchange coupling between the two layers to be smaller than the total magnetic anisotropy of the anti-ferromagnetic layer and larger than the magnetic domain energy of the anti-ferromagnetic layer By the above constitution, it is possible to realize a high energy of magnetic anisotropy of the particles of the magnetic material to raise the coercivity to cope with higher recording density expected in near future.