An experimental investigation of dynamic behavior in FePt systems

Becky Fuller, George Koutsantonis, Robert Stamps

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Magnetic relaxation experiments have been used to investigate the non-equilibrium dynamics ofFePt nanoparticles. The system exhibits ageing at low temperatures, as well as a narrow energydistribution of the barrier to reversal. These properties were found susceptible to being affectedby particle size, matrix and applied field strength. An analysis based on broad rate distributionsis presented and compared with results obtained using energy barrier and viscosityinterpretations. We find that a single broad distribution of relaxation times suggestive ofcooperative effects is sufficient to explain the experimental results.
Original languageEnglish
Pages (from-to)Article number 124203, 11pp
JournalJOURNAL OF PHYSICS : CONDENSED MATTER
Volume21
Issue number12
DOIs
Publication statusPublished - 2009

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