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:
Feb. 07, 2006
Filed:
Jun. 13, 2003
Tetsunori Koda, Moriya, JP;
Akira Yano, Moriya, JP;
Enji Fujita, Matsudo, JP;
Tsuyoshi Onuma, Moriya, JP;
Satoshi Matsunuma, Kamakura, JP;
Tetsunori Koda, Moriya, JP;
Akira Yano, Moriya, JP;
Enji Fujita, Matsudo, JP;
Tsuyoshi Onuma, Moriya, JP;
Satoshi Matsunuma, Kamakura, JP;
Hitachi Maxell, Ltd., Osaka, JP;
Abstract
A magnetic recording medium in which the medium noise is reduced and information can be recorded at a high S/N level, and a method for producing the magnetic recording medium are provided. A magnetic recording apparatus, which is excellent in thermal stability and which makes it possible to perform the high density recording, is provided. When films are formed for the magnetic recording medium based on the perpendicular magnetic recording method, the content of B in a seed layer is made sufficiently larger than the content of B in a recording layer. Accordingly, B is diffused from the seed layer to the recording layer to facilitate the segregation of B at the crystal grain boundary in the recording layer. Thereby, the magnetic interaction between the crystal grains in the recording layer is further reduced. Thus, it is possible to greatly reduce the transition noise.