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Type of Publication: | Journal article |
URI (citable link): | http://nbn-resolving.de/urn:nbn:de:bsz:352-opus-89466 |
Author: | Nowak, Ulrich; Hinzke, Denise |
Year of publication: | 1999 |
Published in: | Journal of Applied Physics ; 85 (1999), 8. - pp. 4337-4339 |
DOI (citable link): | https://dx.doi.org/10.1063/1.370360 |
Summary: |
The mechanisms of thermally activated magnetization switching in small ferromagnetic particles driven by an external magnetic field are investigated. For low uniaxial anisotropy the spins rotate coherently while for sufficiently large uniaxial anisotropy they behave Ising-like, i.e., the switching then is due to nucleation. The crossover from coherent rotation to nucleation is studied for the classical three-dimensional Heisenberg model with uniaxial anisotropy by Monte Carlo simulations. From the temperature dependence of the metastable lifetime the energy barrier of a switching process can be determined. For the case of infinite anisotropy we compare numerical results from simulations of the Ising model with theoretical results for energy barriers for both, single- and multidroplet nucleation. The simulated barriers are in agreement with the theoretical predictions.
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Subject (DDC): | 530 Physics |
Link to License: | In Copyright |
NOWAK, Ulrich, Denise HINZKE, 1999. Magnetization switching in small ferromagnetic particles : Nucleation and coherent rotation. In: Journal of Applied Physics. 85(8), pp. 4337-4339. Available under: doi: 10.1063/1.370360
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