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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, RL
Magnetic 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 Matter

Volume

21

Issue

12

Article number

124203

Number

124203

Pagination

1-11

ISSN

0953-8984

Department/School

School of Natural Sciences

Publisher

Iop Publishing Ltd

Place of publication

Dirac House, Temple Back, Bristol, England, Bs1 6Be

Rights statement

© 2009 IOP Publishing Ltd

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the chemical sciences; Expanding knowledge in the physical sciences

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