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

  • Magnetism and Ferroelectricity
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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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Fiz. Tverd. Tela (St. Petersburg) 40, 1642–1649 (September 1998)

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Kalmykov, Y.P., Titov, S.V. Complex magnetic susceptibility of uniaxial superparamagnetic particles in a strong static magnetic field. Phys. Solid State 40, 1492–1499 (1998). https://doi.org/10.1134/1.1130584

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  • DOI: https://doi.org/10.1134/1.1130584

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