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Journal article
Role of geometrical symmetry in thermally activated processes in clusters of interacting dipolar moments
Physical review. B, v 89(10)
12 Mar 2014
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Thermally activated magnetization decay is studied in ensembles of clusters of interacting dipolar moments by applying themaster-equation formalism, as a model of thermal relaxation in systems of interacting single-domain ferromagnetic particles. Solving the associated master equation reveals a breakdown of the energy barrier picture depending on the geometrical symmetry of structures. Deviations are most pronounced for reduced symmetry and result in a strong interaction dependence of relaxation rates on the memory of system initialization. A simple two-state system description of an ensemble of clusters is developed, which accounts for the observed anomalies. These results follow from a semianalytical treatment, and are fully supported by kinetic Monte Carlo simulations.
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Details
- Title
- Role of geometrical symmetry in thermally activated processes in clusters of interacting dipolar moments
- Creators
- O. Hovorka - University of YorkJ. Barker - University of YorkG. Friedman - Drexel UniversityR. W. Chantrell - University of York
- Publication Details
- Physical review. B, v 89(10)
- Publisher
- Amer Physical Soc
- Number of pages
- 9
- Grant note
- PIEF-GA-2010-273014 / Marie Curie Intra European Fellowship within the 7th European Community Framework Programme
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Electrical and Computer Engineering
- Web of Science ID
- WOS:000332629900003
- Scopus ID
- 2-s2.0-84897885982
- Other Identifier
- 991019169524204721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary
- Physics, Applied
- Physics, Condensed Matter