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. 25, 2014
Filed:
Jun. 11, 2012
Chih-huang Lai, Hsinchu, TW;
Hao-cheng Hou, Hsinchu, TW;
Chao-chien Chiang, Hsinchu, TW;
National Tsing Hua University, Hsinchu, TW;
Abstract
A magnetic recording medium includes: a substrate, and a magnetic recording layer that is made from a material having the chemical formula of FeMnPt, and that has a bottom surface and an upper surface; wherein x, y, and z indicate average atomic concentrations for Fe, Mn, and Pt, and x+y+z is 100, x and y being greater than 0 and not greater than 65, z being in the range from 35 to 60; and wherein atomic concentration of Fe is gradually decreased from the upper surface to the bottom surface, and atomic concentration of Mn is gradually increased from the upper surface to the bottom surface so that the ferromagnetic property of the magnetic recording layer is gradually reduced from the upper surface to the bottom surface.