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. 24, 2016
Filed:
May. 31, 2011
Teiichiro Umezawa, Singapore, SG;
Kazuaki Sakamoto, Singapore, SG;
Teiichiro Umezawa, Singapore, SG;
Kazuaki Sakamoto, Singapore, SG;
WD Media (Singapore) PTE. LTD, Singapore, SG;
Abstract
[Problem] A perpendicular magnetic disk with an improved SNR and an increased recording density by further improving crystal orientation of a preliminary ground layer formed of an Ni-base alloy is provided. [Solution] A typical structure of the perpendicular magnetic disk according to the present invention includes, on a base, a soft magnetic layer, a Ta alloy layerprovided on the soft magnetic layer, an Ni alloy layerprovided on the Ta alloy layer, a ground layerprovided on the Ni alloy layerand having Ru as a main component, and a granular magnetic layerprovided on the ground layer. The Ta alloy layeris a layer containing 10 atomic percent or more and 45 atomic percent or less Ta and having amorphous and soft magnetic properties.