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:
May. 03, 2011
Filed:
Jul. 20, 2007
Ryuji Tsuchiyama, Matsudo, JP;
Masahumi Mochizuki, Chigasaki, JP;
Kyosuke Ono, Hachioji, JP;
Yuko Tsuchiya, Tokorozawa, JP;
Hiroshi Ikekame, Fuchu, JP;
Ryuji Tsuchiyama, Matsudo, JP;
Masahumi Mochizuki, Chigasaki, JP;
Kyosuke Ono, Hachioji, JP;
Yuko Tsuchiya, Tokorozawa, JP;
Hiroshi Ikekame, Fuchu, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a discrete track medium and a patterned medium, a meniscus adsorptive force is reduced and writing into adjacent tracks is prevented. A magnetic layer in lands or patterns in the discrete track medium or the patterned medium is formed into a cylindrical shelly or spherical shelly shape with a uniform thickness. Moreover, a height of cylindrical shelly land or a height of spherical shelly land is changed between 5 nm and 30 nm according to radial positions. Thus, an effect is achieved for providing a magnetic recording medium and a magnetic disk apparatus which are excellent in realizing higher recording density and higher reliability.