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

DOI: 10.1134/1.1130584

Cite this article as:
Kalmykov, Y.P. & Titov, S.V. Phys. Solid State (1998) 40: 1492. doi:10.1134/1.1130584


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.

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