Perpendicular magnetic recording media
First Claim
1. A perpendicular magnetic recording medium comprising:
- at least a first and a second perpendicular magnetic recording layer; and
a substrate supporting the first and the second perpendicular magnetic recording layers, wherein the first and the second perpendicular magnetic recording layers have different physical/magnetic properties and are formed of materials that compensate the different physical/magnetic properties, and wherein the first perpendicular magnetic recording layer has smaller crystal grains than the crystal grains of the second perpendicular magnetic recording layer, and the second perpendicular magnetic recording layer has higher perpendicular magnetic anisotropic energy (Ku) than the first perpendicular magnetic recording layer.
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Abstract
A perpendicular magnetic recording medium having a good thermal stability and a high recording density is provided. The perpendicular magnetic recording medium includes at least a first and a second perpendicular magnetic recording layer and a substrate supporting the first and the second perpendicular magnetic recording layers. The first and the second perpendicular magnetic recording layers have different physical/magnetic properties and are formed of materials that compensate the different physical/magnetic properties. The first and the second perpendicular magnetic recording layers are selected from a layer for improving perpendicular magnetic anisotropic energy (Ku), a layer for reducing the size of crystal grains, a layer for reducing the size of magnetic domains, a layer for increasing an SNR, a layer for improving signal output, a layer for reducing noise, a layer for improving the uniformity of crystal grain sizes, and a layer for improving the uniformity of magnetic domain sizes.
24 Citations
11 Claims
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1. A perpendicular magnetic recording medium comprising:
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at least a first and a second perpendicular magnetic recording layer; and
a substrate supporting the first and the second perpendicular magnetic recording layers, wherein the first and the second perpendicular magnetic recording layers have different physical/magnetic properties and are formed of materials that compensate the different physical/magnetic properties, and wherein the first perpendicular magnetic recording layer has smaller crystal grains than the crystal grains of the second perpendicular magnetic recording layer, and the second perpendicular magnetic recording layer has higher perpendicular magnetic anisotropic energy (Ku) than the first perpendicular magnetic recording layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification