US 2017/0365286 A1 · PERPENDICULAR MAGNETIC RECORDING MEDIUM

Abstract

The magnetic recording medium includes at least a nonmagnetic substrate and a magnetic recording layer, the magnetic recording layer consists of a first magnetic recording layer or a plurality of layers including at least the first magnetic recording layer and a second magnetic recording layer, the first magnetic recording layer has a granular structure including a first magnetic crystal grain and a first nonmagnetic crystal grain boundary, the first magnetic crystal grain consists of an ordered alloy having Fe, Pt and Rh, the first nonmagnetic crystal grain boundary consists of carbon, boron or a combination thereof, the second magnetic recording layer has a granular structure including a second magnetic crystal grain and a second nonmagnetic crystal grain boundary, the second magnetic crystal grain consists of an FePt ordered alloy or an ordered alloy having Fe, Pt and Rh, and the second nonmagnetic crystal grain boundary includes carbon.

Claims10

Dependent claims

A perpendicular magnetic recording medium comprising:

a nonmagnetic substrate;
and
a magnetic recording layer on the nonmagnetic substrate,
wherein:
said magnetic recording layer has a granular structure including a first magnetic crystal grain and a first nonmagnetic crystal grain boundary surrounding said first magnetic crystal grain,
said first magnetic crystal grain consists of an ordered alloy having Fe, Pt and Rh, and
said first nonmagnetic crystal grain boundary consists of carbon, boron or a combination thereof.

4 more elements

Dependencies are inferred from the claim text.

Perpendicular magnetic recording medium

Life of this patent

Perpendicular magnetic recording medium

Life of this patent

Abstract

Claims10