Activation entropy, activation energy, and magnetic viscosity

R. Skomski, R. D. Kirby, D. J. Sellmyer

Research output: Contribution to journalConference articlepeer-review

19 Scopus citations

Abstract

Starting from an exact quantum-statistical description, the influence of the shape of the energy landscape on the magnetic viscosity is investigated. Magnetic phase-space analysis based on Kramers' escape-rate theory of chemical reaction kinetics theory shows that the activation entropy associated with thermally activated hopping modifies the magnetic viscosity by reducing the attempt-frequency prefactor compared to an earlier prediction by Brown [W. F. Brown, Phys. Rev. 130, 1677 (1963)]. Energetic contributions are analyzed in terms of a model applicable to a range of coherent and noncoherent magnetization processes, and in the long-time limit deviations from the linear logarithmic magnetic-viscosity law are found.

Original languageEnglish (US)
Pages (from-to)5069-5071
Number of pages3
JournalJournal of Applied Physics
Volume85
Issue number8 II A
DOIs
StatePublished - Apr 15 1999
EventProceedings of the 43rd Annual Conference on Magnetism and Magnetic Materials - Miami, FL, United States
Duration: Nov 9 1998Nov 12 1998

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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