Perpendicular magnetic recording medium and magnetic memory apparatus
First Claim
1. A perpendicular magnetic recording medium comprising:
- a substrate; and
a recording layer formed on the substrate, the recording layer having a magnetic easy axis substantially perpendicular to the surface of the substrate and including three or more magnetic layers containing a Co alloy having a hcp structure;
wherein two of the magnetic layers included in the recording layer form an anti-ferromagnetic exchange coupling structure;
wherein the two magnetic layers are anti-ferromagnetically exchange coupled via a non-magnetic coupling layer situated therebetween;
wherein the magnetizations of the two magnetic layers are anti-parallel to each other at a remanent magnetization state.
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Abstract
A perpendicular magnetic recording medium is disclosed that includes a substrate, and a recording layer formed on the substrate, the recording layer having a magnetic easy axis substantially perpendicular to the surface of the substrate and including three or more magnetic layers containing a Co alloy having a hcp structure. The two of the magnetic layers included in the recording layer form an anti-ferromagnetic exchange coupling structure. The two magnetic layers are anti-ferromagnetically exchange coupled via a non-magnetic coupling layer situated therebetween. The magnetizations of the two magnetic layers are anti-parallel to each other at a remanent magnetization state.
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Citations
20 Claims
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1. A perpendicular magnetic recording medium comprising:
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a substrate; and a recording layer formed on the substrate, the recording layer having a magnetic easy axis substantially perpendicular to the surface of the substrate and including three or more magnetic layers containing a Co alloy having a hcp structure; wherein two of the magnetic layers included in the recording layer form an anti-ferromagnetic exchange coupling structure; wherein the two magnetic layers are anti-ferromagnetically exchange coupled via a non-magnetic coupling layer situated therebetween; wherein the magnetizations of the two magnetic layers are anti-parallel to each other at a remanent magnetization state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification