Forced response and dynamic hysteresis of magnetic nanoparticles with mixed uniaxial and cubic anisotropy in superimposed strong ac and dc bias fields

Y. P. Kalmykov, S. V. Titov, W. T. Coffey, M. Zarifakis, and W. J. Dowling
Phys. Rev. B 99, 184414 – Published 14 May 2019

Abstract

The stationary response of ferromagnetic nanoparticles with mixed uniaxial and cubic anisotropy to superimposed external ac and dc bias fields of arbitrary strength is investigated using Brown's continuous diffusion of orientations model [W. F. Brown Jr., Phys. Rev. 130, 1677 (1963)]. The susceptibility and dynamic magnetic hysteresis (DMH) loops of an individual nanoparticle are calculated in extensive ranges of the superimposed fields, their orientation, damping, temperature, and specific mixed anisotropy parameter. The DMH loops and nonlinear dynamic susceptibility strongly depend on the dc and ac field strengths, the polar angle between the easy axis of the particle and the external field vectors, as well as the temperature and damping, simultaneously displaying a marked dependence on the mixed anisotropy parameter.

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  • Received 30 November 2018
  • Revised 22 April 2019

DOI:https://doi.org/10.1103/PhysRevB.99.184414

©2019 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
  1. Physical Systems
Statistical Physics & Thermodynamics

Authors & Affiliations

Y. P. Kalmykov1, S. V. Titov2, W. T. Coffey3, M. Zarifakis3,4, and W. J. Dowling3

  • 1Laboratoire de Mathématiques et Physique (EA 4217), Université de Perpignan Via Domitia, F-66860 Perpignan, France
  • 2Kotel'nikov Institute of Radio Engineering and Electronics of the Russian Academy of Sciences, Vvedenskii Square 1, Fryazino, Moscow Region 141120, Russia
  • 3Department of Electronic and Electrical Engineering, Trinity College, Dublin 2, Ireland
  • 4Electricity Supply Board, Generation, Asset Management, Dublin 3, Ireland

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Vol. 99, Iss. 18 — 1 May 2019

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