Physics – Condensed Matter – Materials Science
Scientific paper
2003-12-19
Physica B 348 (2004) 410-419
Physics
Condensed Matter
Materials Science
Scientific paper
10.1016/j.physb.2004.01.005
We investigate the thermal activated magnetisation reversal in a single ferromagnetic nanoparticle with uniaxial anisotropy using Monte Carlo simulations. The aim of this work is to reproduce the reversal magnetisation by uniform rotation at very low temperature in the high energy barrier hypothesis, that is to realize the N\'eel-Brown model. For this purpose we have considered a simple cubic nanoparticle where each site is occupied by a classical Heisenberg spin. The Hamiltonian is the sum of an exchange interaction term, a single-ion anisotropy term and a Zeeman interaction term. Our numerical data of the thermal variation of the switching field are compared to an approximated expression and previous experimental results on Co nanoparticles.
Berche Pierre Emmanuel
Ledue Denis
Patte Renaud
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