This title appears in the Scientific Report :
2011
Please use the identifier:
http://hdl.handle.net/2128/23202 in citations.
Please use the identifier: http://dx.doi.org/10.1088/0953-8984/23/39/394204 in citations.
Thermally activated magnetization reversal in monatomic magnetic chains on surfaces studied by classical atomistic spin-dynamics simulations
Thermally activated magnetization reversal in monatomic magnetic chains on surfaces studied by classical atomistic spin-dynamics simulations
We 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...
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Personal Name(s): | Bauer, D. |
---|---|
Mavropoulos, Ph. / Lounis, S. / Blügel, S. | |
Contributing Institute: |
Quanten-Theorie der Materialien; IAS-1 Quanten-Theorie der Materialien; PGI-1 Jülich-Aachen Research Alliance - Simulation Sciences; JARA-SIM JARA-FIT; JARA-FIT |
Published in: | Journal of physics / Condensed matter, 23 (2011) S. 394204 |
Imprint: |
Bristol
IOP Publ.
2011
|
Physical Description: |
394204 |
PubMed ID: |
21921308 |
DOI: |
10.1088/0953-8984/23/39/394204 |
Document Type: |
Journal Article |
Research Program: |
Grundlagen für zukünftige Informationstechnologien |
Series Title: |
Journal of Physics: Condensed Matter
23 |
Subject (ZB): | |
Link: |
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Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1088/0953-8984/23/39/394204 in citations.
We 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. |