Journal
IEEE TRANSACTIONS ON MAGNETICS
Volume 43, Issue 6, Pages 2145-2147Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMAG.2007.892852
Keywords
coercivity time dependence; magnetic grains; magnetic reversal; multilayer media; perpendicular recording; thermal energy barriers
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Thermal stability is critical for magnetic grains in high density recording applications. Composite media grains consisting primarily of a hard and soft layer with intergrain exchange coupling are examined. Here it is shown, as in single domain particles, that power laws, to a good approximation, describe the field dependence of the energy barrier. In general, the power law exponent decreases with increasing relative moment and/or decreasing relative anisotropy of the soft/hard subgrain. Results for a variety of medium parameters as well as grain orientations are given.
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