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. 24, 2015
Filed:
Aug. 06, 2013
Perpendicular magnetic recording media with magnetic anisotropy gradient and local exchange coupling
Seagate Technology Llc, Cupertino, CA (US);
Shaoping Li, Naperville, IL (US);
Kaizhong Gao, North Oaks, MN (US);
Lei Wang, Apple Valley, MN (US);
Wenzhong Zhu, Apple Valley, MN (US);
Xiaobin Wang, Chanhassen, MN (US);
Seagate Technology LLC, Cupertino, CA (US);
Abstract
A perpendicular magnetic recording medium adapted for high recording density and high data recording rate comprises a non-magnetic substrate having at least one surface with a layer stack formed thereon, the layer stack including a perpendicular recording layer containing a plurality of columnar-shaped magnetic grains extending perpendicularly to the substrate surface for a length, with a first end distal the surface and a second end proximal the surface, wherein each of the magnetic grains has: (1) a gradient of perpendicular magnetic anisotropy field Hextending along its length between the first end and second ends; and (2) predetermined local exchange coupling strengths along the length.