A stochastic model for magnetic dynamics in single-molecule magnets

Hysteresis and magnetic relaxation curves were performed on double well potential systems with quantum tunneling possibility via stochastic simulations. Simulation results are compared with experimental ones using the Mn12 single-molecule magnet, allowing us to introduce time dependence in the model...

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Bibliographic Details
Published in:	Journal of magnetism and magnetic materials Vol. 403; pp. 188 - 192
Main Authors:	López-Ruiz, R., Almeida, P.T., Vaz, M.G.F., Novak, M.A., Béron, F., Pirota, K.R.
Format:	Journal Article
Language:	English
Published:	Elsevier B.V 01-04-2016
Subjects:	Anisotropy Computer simulation Dynamical systems Dynamics Magnets Quantum tunnelling Relaxation time Single-molecule magnets Stochastic processes Stochasticity Tunneling magnetization reversal Stochastic processes Tunneling magnetization reversal Single-molecule magnets
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Summary:	Hysteresis and magnetic relaxation curves were performed on double well potential systems with quantum tunneling possibility via stochastic simulations. Simulation results are compared with experimental ones using the Mn12 single-molecule magnet, allowing us to introduce time dependence in the model. Despite being a simple simulation model, it adequately reproduces the phenomenology of a thermally activated quantum tunneling and can be extended to other systems with different parameters. Assuming competition between the reversal modes, thermal (over) and tunneling (across) the anisotropy barrier, a separation of classical and quantum contributions to relaxation time can be obtained. •Single-molecule magnets are modeled using a simple stochastic approach.•Simulation reproduces thermally-activated tunnelling magnetization reversal features.•The time is introduced in hysteresis and relaxation simulations.•We can separate the quantum and classical contributions to decay time.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0304-8853
DOI:	10.1016/j.jmmm.2015.11.070