Stock material or miscellaneous articles – Magnetic recording component or stock – Thin film media
Reexamination Certificate
2011-06-28
2011-06-28
Ruthkosky, Mark (Department: 1785)
Stock material or miscellaneous articles
Magnetic recording component or stock
Thin film media
C428S821000, C428S827000
Reexamination Certificate
active
07968219
ABSTRACT:
A magnetic disk includes a substrate, a soft magnetic underlayer disposed over the substrate, and a media layer disposed over the underlayer. The underlayer includes a first plurality of layers each containing NiFe having an atomic concentration of iron that is at least about thirty percent. The underlayer further includes a second plurality of layers that is interleaved with the first plurality of layers. The second plurality of layers each contain FeCoN having an atomic concentration of iron that is greater than an atomic concentration of cobalt, and having an atomic concentration of nitrogen that is less than the atomic concentration of cobalt. The atomic concentration of nitrogen is less than eight percent. The media layer contains a magnetically hard material having an easy axis of magnetization oriented substantially perpendicular to both the media layer and the underlayer.
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Chen Yingjian
Jiang Hai
Sin Kyusik
Harris Gary
Ruthkosky Mark
Western Digital (Fremont) , LLC
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