Perpendicular magnetic recording medium and method of manufacturing perpendicular magnetic recording medium
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United States of America Patent
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Nov 10, 2015
Grant Date -
Feb 13, 2014
app pub date -
Oct 10, 2013
filing date -
Mar 26, 2008
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Abstract
A perpendicular magnetic recording medium 100 having a magnetic recording layer 122, wherein a particle diameter of crystal grains in layer 122 improves a SNR while a high coercive force is maintained. There also is at least a ground layer 118, a first magnetic recording layer 122a, and a second magnetic recording layer 122b in this order on a disk base 110. The first layer 122a and the second layer 122b are ferromagnetic layers, each having a granular structure in which a grain boundary part made of a non-magnetic substance is formed between crystal grains each grown in a columnar shape, and A122a is taken as A nm and an average particle diameter of the crystal grains in the second magnetic recording layer 122b is taken as B nm.
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