PERPENDICULAR MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE DEVICE

Title:

PERPENDICULAR MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE DEVICE

Document Type and Number:

WIPO Patent Application WO/2010/053106

Kind Code:

A1

Abstract:

Provided is a medium that has high perpendicular magnetic anisotropy energy and high coercivity at room temperature, that has a low Curie temperature, and that enables recording even at low power with the perpendicular magnetic anisotropy energy and coercivity lowered. The perpendicular magnetic recording medium comprises a ground layer (102) and an intermediate layer (103) provided on a substrate (101) and a magnetic recording layer (104) that has perpendicular magnetic anisotropy at room temperature, and provides recording with the perpendicular magnetic anisotropy of the magnetic recording layer lowered by irradiation with energy. The intermediate layer comprises Ru and/or Pd. The magnetic recording layer is a laminate of a ferromagnetic metal layer (108) having Co as the principal component and a nonmagnetic metal layer (109) having Pd as the principal component. The ferromagnetic metal layer is from 0.15‑0.25 nm thick, the nonmagnetic metal layer is from 0.45‑0.8 nm thick, the thickness ratio of the ferromagnetic metal layer and the nonmagnetic metal layer is from 2‑4, and the difference in magnetic coercivity with energy irradiation and without irradiation is at least 8 kOe.

Inventors:

HIROTSUNE AKEMI (JP)

Application Number:

PCT/JP2009/068866

Publication Date:

May 14, 2010

Filing Date:

November 05, 2009

Export Citation:

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Assignee:

HITACHI LTD (JP)
HIROTSUNE AKEMI (JP)

International Classes:

G11B5/673; G11B5/02; G11B5/66; G11B5/738

Foreign References:

JP2008021365A	2008-01-31
JP2006209903A	2006-08-10
JP2005038569A	2005-02-10