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Simulation of ferromagnetic resonance spectra of linear chains of magnetite nanocrystals

Charilaou, M., M. Winklhofer, and A. U. Gehring (2011), Simulation of ferromagnetic resonance spectra of linear chains of magnetite nanocrystals, J. Appl. Phys., 109(9), 093903, 081108JAP, doi:10.1063/1.3581103.

Abstract
Ensembles of linear chains of stable single domain magnetite crystals, as in magnetotactic bacteria,
exhibit a distinctly asymmetric ferromagnetic resonance (FMR) signal, with a pronounced high-field
minimum and two or three low-field maxima in the derivative spectrum. To identify the microscopic
origin of these traits, we have simulated FMR spectra of dilute suspensions of linear chains oriented
randomly in space by modeling the chain as a StonerWohlfarth-type rotation ellipsoid whose long
axis coincides with an easy [111] axis of the cubic magnetocrystalline anisotropy system. The
validity of the model is examined by comparing the results to explicit calculations of the interactions
among the particles in the chain. The single ellipsoid model reproduces the experimentally observed
FMR traits and can be related to the explicit chain model by adjusting the contribution to the uniaxial
anisotropy along the chain axis to account for the magnetostatic interactions. Finally, we provide a
practical approximation for simulating and fitting FMR spectra of one-dimensional assemblies.
Further information
BibTeX
@article{id1666,
  author = {M. Charilaou and M. Winklhofer and A. U. Gehring},
  journal = {J. Appl. Phys.},
  month = {may},
  number = {9},
  pages = {093903},
  title = {{Simulation of ferromagnetic resonance spectra of linear chains of magnetite nanocrystals}},
  volume = {109},
  year = {2011},
  language = {en},
  url = {http://link.aip.org/link/doi/10.1063/1.3581103},
  doi = {10.1063/1.3581103},
  eid = {081108JAP},
}
EndNote
%0 Journal Article
%A Charilaou, M.
%A Winklhofer, M.
%A Gehring, A. U.
%D 2011
%N 9
%V 109
%J J. Appl. Phys.
%P 093903
%T Simulation of ferromagnetic resonance spectra of linear chains of magnetite nanocrystals
%U http://link.aip.org/link/doi/10.1063/1.3581103
%8 may
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