Spin dynamics of magnetic nanoparticles : Beyond Brown ’ s theory

  title={Spin dynamics of magnetic nanoparticles : Beyond Brown ’ s theory},
  author={Ulrich Nowak and Oleg N. Mryasov and Robert Wieser and Konstantin Y. Guslienko and R. W. Chantrell},
An investigation of thermally induced spin dynamics of magnetic nanoparticles is presented. We use an atomistic model for the magnetic interactions within an effective, classical spin Hamiltonian constructed on the basis of first-principles calculations for L10 FePt. Using Langevin dynamics we investigate how the internal degrees of freedom affect the switching behavior at elevated temperatures. We find significant deviations from a single-spin model, arising from the temperature dependence of… CONTINUE READING