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Magnetostatic interactions in a natural magnetite/ulvöspinel system

Evans, M. E., D. Krása, W. Williams, and M. Winklhofer (2006), Magnetostatic interactions in a natural magnetite/ulvöspinel system, J. Geophys. Res., 111(B12), B12S16, doi:10.1029/2006JB004454.

Magnetostatic interactions have been investigated in an intergrown material consisting of ~200 nm magnetite blocks separated by ~30 nm-wide ulvöspinel lamellae. FORC measurements provide a direct measure of the interaction fields, giving a value for the full width at half-maximum (FWHM) of 30 mT (at Hc=20 mT). Hysteresis parameters are Mrs/Ms=0.22, Hcr/Hc=1.98 and TED=0.18. Elimination of the intergrowth structure (by heating in vacuo) causes the FORC contours to shrink down towards the origin, yielding FWHM=14 mT (at Hc=6 mT) with corresponding changes in Mrs/Ms, Hcr/Hc and TED to 0.11, 2.73 and 0.28, respectively. All these characteristics reveal the strong influence of particle-to-particle magnetostatic interactions between the magnetite blocks in the starting material and demonstrate the change from SD/PSD to MD behavior due to the fundamental structural change brought about by the experimental homogenization. Micromagnetic calculations of particle assemblages representative for the intergrown structure confirm that the magnetite blocks will interact by assuming a supervortex magnetization structure.
Further information
  author = {M. E. Evans and D. Kr{\'a}sa and W. Williams and M. Winklhofer},
  journal = {J. Geophys. Res.},
  month = {oct},
  number = {B12},
  pages = {B12S16},
  title = {{Magnetostatic interactions in a natural magnetite/ulv{\"o}spinel system}},
  volume = {111},
  year = {2006},
  language = {en},
  url = {http://www.agu.org/journals/jb/jb0610/2006JB004454/2006JB004454.pdf},
  doi = {10.1029/2006JB004454},
%0 Journal Article
%A Evans, M. E.
%A Krása, D.
%A Williams, W.
%A Winklhofer, M.
%D 2006
%N B12
%V 111
%J J. Geophys. Res.
%P B12S16
%T Magnetostatic interactions in a natural magnetite/ulvöspinel system
%U http://www.agu.org/journals/jb/jb0610/2006JB004454/2006JB004454.pdf
%8 oct
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