US 2008/0292909 A1 · MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE APPARATUS

Abstract

This magnetic recording medium has a substrate, a nonmagnetic granular layer formed above the substrate and a recording layer formed on the nonmagnetic granular layer. The nonmagnetic granular layer is made of CoCr alloy with an hcp or an fcc crystal structure in which a nonmagnetic material segregates virtually-columnar magnetic grains. The magnetic recording medium and the magnetic storage apparatus in which the medium is used have improved reading/writing performances.

Claims20

Dependent claims

A magnetic recording medium, comprising:

a substrate;
a nonmagnetic granular layer formed on said substrate;
and
a recording layer formed on said nonmagnetic granular layer,
wherein said nonmagnetic granular layer is made of CoCr alloy with an hcp or an fcc crystal structure in which a nonmagnetic material segregates virtually-columnar magnetic grains.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

12/114,431Filed 2 May 2008

Priority

JP 2007-13597222 May 2007

Published

27 Nov 2008

Term ends

Not estimatedThe source records don’t support an estimate.

Classification14 codes

G11B 5/658
Characterised by its composition: containing oxygen, e.g. molecular oxygen or magnetic oxide
G11B 5/657
Characterised by its composition: containing inorganic, non-oxide compound of Si, N, P, B, H or C, e.g. in metal alloy or compound
G11B 5/667
The record carriers consisting of several layers: including a soft magnetic layer
G11B 5/672
The record carriers consisting of several layers: having different compositions in a plurality of magnetic layers, e.g. layer compositions having…

Magnetic recording medium and magnetic storage apparatus

Life of this patent

Magnetic recording medium and magnetic storage apparatus

Life of this patent

Abstract

Claims20