Physics of the Solid State

, Volume 40, Issue 9, pp 1492–1499

Complex magnetic susceptibility of uniaxial superparamagnetic particles in a strong static magnetic field

  • Yu. P. Kalmykov
  • S. V. Titov
Magnetism and Ferroelectricity

Abstract

The magnetic relaxation of a system of single-domain ferromagnetic particles in the presence of a strong static magnetic field directed at an arbitrary angle relative to the particle anisotropy axis is investigated. A system of linear difference-differential equations for the moments (averaged spherical harmonics) is derived without recourse to the Fokker-Planck equation by averaging Gilbert’s equations with a fluctuating field. An exact solution (in terms of matrix continuous fractions) is found for this system. The relaxation times and spectra of the complex magnetic susceptibility are calculated.

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Copyright information

© American Institute of Physics 1998

Authors and Affiliations

  • Yu. P. Kalmykov
    • 1
  • S. V. Titov
    • 1
  1. 1.Institute of Radio Engineering and ElectronicsRussian Academy of SciencesFryazino, Moscow RegionRussia

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