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Article Dans Une Revue Physica B: Condensed Matter Année : 2004

Magnetisation switching in a ferromagnetic Heisenberg nanoparticle with uniaxial anisotropy: A Monte Carlo investigation

Denis Ledue
Renaud Patte

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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Dates et versions

hal-00000979 , version 1 (19-12-2003)

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Denis Ledue, Pierre-Emmanuel Berche, Renaud Patte. Magnetisation switching in a ferromagnetic Heisenberg nanoparticle with uniaxial anisotropy: A Monte Carlo investigation. Physica B: Condensed Matter, 2004, 348, pp.410-419. ⟨10.1016/j.physb.2004.01.005⟩. ⟨hal-00000979⟩
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