Electricity: measuring and testing – Magnetic – Magnetic information storage element testing
Reexamination Certificate
2005-01-18
2005-01-18
Patidar, Jay (Department: 2862)
Electricity: measuring and testing
Magnetic
Magnetic information storage element testing
C360S025000
Reexamination Certificate
active
06844724
ABSTRACT:
A method of measuring the magnetic moment (Mrt) and anisotropy field strength (Hk) of a perpendicular magnetic recording medium comprising a planar-surfaced perpendicular recording layer and a magnetically soft underlayer (SUL) is provided. A compensated magnetic moment (Mrt)compof the recording layer is determined for a given strength (H) of a generally in-plane magnetic field applied generally to the recording layer. The compensated magnetic moment (Mrt)compof the recording layer is determined for a plurality of different in-plane applied magnetic field (H) strengths to determine the variation of the compensated magnetic moment (Mrt)compof the recording layer as a function of the strength (H) of the generally in-plane applied magnetic fields. The remanent magnetic moment (Mrt(0)) at zero (0) field strength (H) and the anisotropy field strength (Hk) is determined from the measured variation of the compensated magnetic moment (Mrt)compof the recording layer as a function of the strength (H) of the generally in-plane applied magnetic fields.
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Peng Qingzhi
Richter Hans Jürgen
Aurora Reena
McDermott Will & Emery LLP
Patidar Jay
Seagate Technology LLC
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