PERPENDICULAR MAGNETIC RECORDING MEDIUM AND ITS MANUFACTURING METHOD

Title:

PERPENDICULAR MAGNETIC RECORDING MEDIUM AND ITS MANUFACTURING METHOD

Document Type and Number:

Japanese Patent JP2001101650

Kind Code:

A

Abstract:

To provide a perpendicular magnetic recording medium for extra high density magnetic recording.

The perpendicular magnetic recording medium is composed of a substrate, a ferromagnetic thin film and a Ru thin film or a Ru-based alloy thin film provided between the ferromagnetic thin film and the substrate. It is preferable that the ferromagnetic thin film and the Ru thin film or the Ru-based alloy thin film are provided by being in contact with each other, coercive force of magnetic hysteresis curve measured by applying an external magnetic field in a direction perpendicular to a ferromagnetic thin film surface is ≥25000e, squareness ratio which is defined as a ratio of residual magnetization to saturation magnetization is ≥0.5 and film thickness of the Ru thin film or the Ru-based alloy thin film is ≥1 nm to ≤100 nm.

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Inventors:

MURAYAMA AKIHIRO
HIRUMA TAKEHIKO
IMAGAWA MAKOTO
SUEKANE MICHINOBU

Application Number:

JP27923899A

Publication Date:

April 13, 2001

Filing Date:

September 30, 1999

Export Citation:

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Assignee:

ASAHI KOMAGU KK

International Classes:

G11B5/738; G11B5/64; G11B5/65; G11B5/667; G11B5/851; (IPC1-7): G11B5/738

Attorney, Agent or Firm:

Tsunoda Mamoru

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