Extremely high density magnetic recording media, with production methodology controlled longitudinal/perpendicular orientation, grain size and coercivity
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United States of America Patent
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-
Apr 29, 2003
Grant Date -
Nov 1, 2001
app pub date -
Mar 12, 2001
filing date -
Mar 18, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed is a modulated grain-composition magnetic recording material with up to terabit areal density recording capacity which, preferably, is produced by sequential vacuum deposition and subsequent annealing procedures that allow selective fabrication of magnetic material with desired grain size and coercivity, and with desired longitudinal or perpendicular magnetic particle 'c-axis' orientation. The preferred magnetic recording material has multiple layers of FePt/B.sub.2 O.sub.3 and/or Fe/Pt/B.sub.2 O.sub.3, with minimum grain size of approximately ten (10) nanometers, with perpendicularly oriented 'c-axis', and with coercivity (Hc) of up to twelve (12) K-Oe. The preferred fabrication procedure involves sequential sputter deposition of FePt and B.sub.2 O.sub.3 layers, followed by an anneal step.
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