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000016692 084__ $$2WoS$$aPhysics, Condensed Matter
000016692 1001_ $$0P:(DE-Juel1)VDB33813$$aBauer, D.$$b0$$uFZJ
000016692 245__ $$aThermally activated magnetization reversal in monatomic magnetic chains on surfaces studied by classical atomistic spin-dynamics simulations
000016692 260__ $$aBristol$$bIOP Publ.$$c2011
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000016692 440_0 $$03703$$aJournal of Physics: Condensed Matter$$v23$$x0953-8984$$y39
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000016692 500__ $$aWe are grateful to Dr Riccardo Hertel for discussions on the physics of magnetization dynamics, Dr Laszlo Szunyogh for discussions on the form of the anisotropy tensor in surface-supported chains, and Professor Christian Schroder for discussions on the methodology of atomistic spin dynamics. This work has been supported in part by FP7 EU-ITN FANTOMAS. SL wishes to thank the Alexander von Humboldt Foundation for a Feodor Lynen Fellowship and also Professor D L Mills for hospitality at the UC-Irvine.
000016692 520__ $$aWe analyse the spontaneous magnetization reversal of supported monatomic chains of finite length due to thermal fluctuations via atomistic spin-dynamics simulations. Our approach is based on the integration of the Landau-Lifshitz equation of motion of a classical spin Hamiltonian in the presence of stochastic forces. The associated magnetization lifetime is found to obey an Arrhenius law with an activation barrier equal to the domain wall energy in the chain. For chains longer than one domain wall width, the reversal is initiated by nucleation of a reversed magnetization domain primarily at the chain edge followed by a subsequent propagation of the domain wall to the other edge in a random-walk fashion. This results in a linear dependence of the lifetime on the chain length, if the magnetization correlation length is not exceeded. We studied chains of uniaxial and triaxial anisotropy and found that a triaxial anisotropy leads to a reduction of the magnetization lifetime due to a higher reversal attempt rate, even though the activation barrier is not changed.
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000016692 7001_ $$0P:(DE-Juel1)130823$$aMavropoulos, Ph.$$b1$$uFZJ
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000016692 7001_ $$0P:(DE-Juel1)130548$$aBlügel, S.$$b3$$uFZJ
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