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We investigate the dynamics of a magnetic system consisting of two magneticmoments coupled by either exchange, dipole-dipole, or Dzyalozhinski-Moriyainteraction. We compare the switching mechanisms and switching rates as inducedby the three couplings. For each coupling and each configuration of the twoanisotropy axes, we describe the switching modes and, using the kinetic theoryof Langer, we provide (semi-)analytical expressions for the switching rate. Wethen compare the three interactions with regard to their efficiency in thereversal of the net magnetic moment of the dimer. We also investigate how theenergy barriers vary with the coupling. For the dipole-dipole interaction wefind that the energy barrier may either increase or decrease with the couplingdepending on whether the latter is weak or strong. Finally, upon comparing thevarious switching rates, we find that the dipole-dipole coupling leads to theslowest magnetic dimer, as far as the switching of its net magnetic moment isconcerned.

Dynamics of a magnetic dimer with exchange, dipolar and Dzyalozhinski-Moriya interaction