Perpendicular magnetic recording medium and method of manufacturing the same
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United States of America Patent
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Oct 13, 2015
Grant Date -
Nov 4, 2010
app pub date -
Oct 14, 2008
filing date -
Oct 15, 2007
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Abstract
A perpendicular magnetic recording medium includes a substrate, a soft magnetic layer, a pre-underlayer, an underlayer, and a main recording layer serving as a magnetic recording layer. The pre-underlayer contains seed crystal grains that serve as a base for crystal grains of the underlayer, and an addition substance that is added between the seed crystal grains and composed of an element having an atomic radius smaller than that of an element forming the seed crystal grains.
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