Abstract
The activation volume of an interacting pair of uniaxially anisotropic fine ferromagnetic particles is studied assuming a dipole approximation, for the case of the applied field parallel to the bond direction and the common anisotropy axis. Using an analytical treatment, it is shown that the activation volume depends primarily on activation energy and to a smaller extent on the location of the saddle point of the transition. The incoherent reversal by ‘‘fanning’’ and the collective thermal excitations of the magnetization result in a reduction of the activation volume. The dependence on coupling strength is also discussed. Numerical calculations using the Langevin formalism provide a correction to the theory that is significant in the limit of very short relaxation times.
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