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

Authors

  • Yu. P. Kalmykov
    • Institute of Radio Engineering and ElectronicsRussian Academy of Sciences
  • S. V. Titov
    • Institute of Radio Engineering and ElectronicsRussian Academy of Sciences
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

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.

Download to read the full article text

Copyright information

© American Institute of Physics 1998