Perpendicular magnetic recording medium
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United States of America Patent
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Apr 9, 2013
Grant Date -
Dec 27, 2007
app pub date -
Dec 22, 2006
filing date -
Jun 22, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A perpendicular magnetic recording medium is provided. The perpendicular magnetic recording medium includes: a perpendicular magnetic recording layer formed on a substrate; and at least one soft magnetic under-layer formed between the substrate and the perpendicular magnetic recording layer, wherein the soft magnetic under-layer is made from an alloy of a non-magnetic material and a magnetic material which exists in the form of granular nanoparticles in matrix of the non-magnetic material, and at least two of the magnetic nanoparticles are spaced apart from one another by a predetermined distance so as to mutually make an anti-ferromagnetic coupling.
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