Stock material or miscellaneous articles – Magnetic recording component or stock – Thin film media
Reexamination Certificate
2011-06-14
2011-06-14
Bernatz, Kevin M (Department: 1785)
Stock material or miscellaneous articles
Magnetic recording component or stock
Thin film media
C428S836000, C360S048000, C360S135000
Reexamination Certificate
active
07960044
ABSTRACT:
A patterned perpendicular magnetic recording disk has a pre-patterned disk substrate with pillars and trenches arranged in data regions and servo regions. In the data regions, the height of the data pillars is equal to or greater than the spacing between the data pillars, while in the servo regions the height of the servo pillars is less than the spacing between the servo pillars. A magnetic recording material with perpendicular magnetic anisotropy is deposited over the entire disk substrate, which results in magnetic material on the tops of the data pillars and servo pillars and in the servo trenches. The material in the data trenches is either nonmagnetic or discontinuous. After the application of a high DC magnetic field in one perpendicular direction and a low DC magnetic field in the opposite direction, the resulting disk has patterned servo sectors with servo pillars all magnetized in the same perpendicular direction and servo trenches magnetized in the opposite perpendicular direction.
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Albrecht Thomas R
Bandic Zvonimir Z.
Hellwig Olav
Zeltzer Gabriel
Bernatz Kevin M
Berthold Thomas R.
Hitachi Global Storage Technologies - Netherlands B.V.
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