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Graded Anistropy

Graded anisotropy (Ku) materials are one possible solution to the magnetic recording “trilemma” where the thermal stability, writability, and signal-to-noise ratio must be simultaneously balanced for successful long-term storage. In graded-Ku materials the low-Ku layers act to reduce the writing field while the high-Ku layers preserve thermal stability.

The approach primarily pursued by our group relies on the fabrication of continuously graded FePtCu single films where we take advantage of the strong dependence of the low-Ku A1 phase to the high-Ku L10 ordering temperature in compositionally graded (Fe53Pt47)100−xCux ( x=0–30). The Ku-gradient is then established after proper post-annealing. In addition to conventional magnetometry, subsequent characterization is then carried out using the magneto-optical Kerr effect (MOKE), first-order reversal curves (FORCs), and polarized neutron reflectivity (PNR).

Page Manager: Måns Henningson|Last update: 9/16/2015
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