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An experimental investigation of dynamic behavior in FePt systems
journal contribution
posted on 2023-05-21, 14:25 authored by Rebecca FullerRebecca Fuller, Koutsantonis, GA, Stamps, RLMagnetic relaxation experiments have been used to investigate the non-equilibrium dynamics of FePt nanoparticles. The system exhibits ageing at low temperatures, as well as a narrow energy distribution of the barrier to reversal. These properties were found susceptible to being affected by particle size, matrix and applied field strength. An analysis based on broad rate distributions is presented and compared with results obtained using energy barrier and viscosity interpretations. We find that a single broad distribution of relaxation times suggestive of cooperative effects is sufficient to explain the experimental results.
History
Publication title
Journal of Physics: Condensed MatterVolume
21Issue
12Article number
124203Number
124203Pagination
1-11ISSN
0953-8984Department/School
School of Natural SciencesPublisher
Iop Publishing LtdPlace of publication
Dirac House, Temple Back, Bristol, England, Bs1 6BeRights statement
© 2009 IOP Publishing LtdRepository Status
- Restricted