Magnetisation switching in a ferromagnetic Heisenberg nanoparticle with uniaxial anisotropy: A Monte Carlo investigation
Résumé
We investigate the thermal activated magnetisation reversal in a single ferromagneticnanoparticle with uniaxial anisotropy using Monte Carlo simulations. The aim of this work is toreproduce the reversal magnetisation by uniform rotation at very low temperature in the highenergy barrier hypothesis, thatis to realize the Néel-Brown model. For this purpose we have considered a simple cubicnanoparticle where each site is occupied by a classical Heisenberg spin. The Hamiltonian isthe sum of an exchange interaction term, a single-ion anisotropy term and a Zeemaninteraction term. Our numerical data of the thermal variation of the switching field arecompared to an approximated expression and previous experimental results on Co nanoparticles.
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