Volume 62, Number 5, June 2003
|Page(s)||650 - 656|
|Published online||01 May 2003|
Effect of exchange interaction on superparamagnetic relaxation
Laboratoire de Magnétisme et d'Optique, Université de Versailles St. Quentin 45 av. des Etats-Unis, 78035 Versailles Cedex, France
Corresponding author: email@example.com
Accepted: 2 April 2003
We use Langer's approach to calculate the reaction rate of a system of two (classical) spins interacting via the exchange coupling J in a magnetic field H, with uniaxial anisotropy of constant K. We find a particular value of the exchange coupling, that is , where , which separates two regimes corresponding to a two-stage and one-stage switching. For the Néel-Brown result for the one-spin problem is recovered.
PACS: 05.40.-a – Fluctuation phenomena, random processes, noise, and Brownian motion / 75.50.Tt – Fine-particle systems; nanocrystalline materials
© EDP Sciences, 2003
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