Measurement of the attempt frequency in antiferromagnets

摘要

The characteristic relaxation frequency of a granular antiferromagnet f0 in the Néel–Arrheniusnexpression has been calculated from a high resolution measurement of the time dependence of thenmedian blocking temperature of a CoFe/IrMn exchange biased system. Calculations based on angranular model give f0 =u00022.1u00020.4u0003u00031012ns−1n, three orders of magnitude greater than valuesncommonly found in the literature. © 2010 American Institute of Physics. u0004doi:10.1063/1.3522887