PERPENDICULAR MAGNETIC RECORDING MEDIUM AND METHOD FOR PRODUCING THE SAME
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United States of America Patent
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Aug 4, 2016
app pub date -
Aug 25, 2014
filing date -
Sep 12, 2013
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Abstract
A perpendicular magnetic recording medium which has a magnetic layer comprising a material having FePt alloy as a main component on a substrate, characterized in that the magnetic layer is an FePtAg—C or FePt—C granular thin film obtained by laminating a unit in multiple stages, the unit being a laminate film obtained by forming, on an FePtAg—C layer or an FePt—C layer, at least one layer of (A) FePtAg layer or FePt layer or (B) FePtAg—C layer or FePt—C layer which has carbon concentration different from the above FePtAg—C layer or FePt—C layer. Consequently, a perpendicular magnetic recording medium using an FePtAg—C or FePt—C granular thin film which satisfies both the high order and columnar structure required for achieving recording density of more than 1 Tbit/in2, for example, can be provided.
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