PERPENDICULAR MAGNETIC RECORDING MEDIUM AND MANUFACTURING METHOD OF THE SAME
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United States of America Patent
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app pub date -
Mar 4, 2016
filing date -
Jan 4, 2016
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Abstract
According to one embodiment, a perpendicular magnetic recording medium includes a substrate, an underlayer including projections arranged at an average interval of 3 to 20 nm, an amorphous magnetic recording layer having a plurality of columnar magnetic grains on the surface of the projections, each having a magnetization easy axis in a direction perpendicular to a surface of the underlayer. The underlayer is formed such that 0.5d≦r≦1.5d, where r is the radius of curvature of a vertical section of each projection and d is the average interval between the projections.
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