Patent Number: 6,310,837

Title: Magnetic recording medium

Abstract: The invention is a magnetic recording medium which is effectively protected against forgery by the alteration of recorded data, and a method for carrying out writing and reading on this magnetic recording medium. The magnetic recording medium of the invention comprises a recording material composed of a crystalline alloy containing Fe and Al . In the recoding material, the total amount of Fe and Al is at least 90 at % and the atomic ratio Al/(Fe+Al) ranges from 0.30 to 0.45. The recording material changes from a disordered phase to an ordered phase by heating. The recording material has a saturation magnetization of at least 45 emu/g prior to heating and lowers its saturation magnetization by at least 35 emu/g upon heating. Dark regions are observable in a bright-field image of the recording material by transmission electron microscopy, the dark regions accounting for 15-60% of the recording material in areal ratio and having a maximum breadth of 10-200 nm.

Inventors: Chou; Tsutomu (Chiba, JP), Shigeta; Masao (Chiba, JP), Karatsu; Masahiro (Chiba, JP), Fujii; Mari (Chiba, JP), Ishizaka; Chikara (Chiba, JP), Saito; Katsumi (Chiba, JP), Wakayama; Katsuhiko (Ibaraki, JP), Mimura; Shohei (Kanagawa, JP), Ito; Masahiro (Kanagawa, JP)

Assignee: TDK Corporation

International Classification: G06K 19/06 (20060101); G11B 005/66 (); G11B 011/00 ()

Expiration Date: 10/30/2018