Reference : Dipolar-coupled moment correlations in clusters of magnetic nanoparticles
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Physics and Materials Science
http://hdl.handle.net/10993/38322
Dipolar-coupled moment correlations in clusters of magnetic nanoparticles
English
Bender, Philipp Florian mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
Wetterskog, E. [> >]
Honecker, Dirk mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit]
Fock, J. [> >]
Frandsen, C. [> >]
Moerland, C. [> >]
Bogart, L. K. [> >]
Posth, O. [> >]
Szczerba, W. [> >]
Gavilán, H. [> >]
Costo, R. [> >]
Fernández-Díaz, M. T. [> >]
González-Alonso, D. [> >]
Fernández Barquín, L. [> >]
Johansson, C. [> >]
2018
Physical Review. B, Condensed Matter
American Physical Society
98
224420
Yes (verified by ORBilu)
International
0163-1829
1095-3795
New York
MD
[en] Here, we resolve the nature of the moment coupling between 10-nm dimercaptosuccinic acid–coated magnetic
<br />nanoparticles. The individual iron oxide cores were composed of >95% maghemite and agglomerated to
<br />clusters. At room temperature the ensemble behaved as a superparamagnet according to Mössbauer and magnetization
<br />measurements, however, with clear signs of dipolar interactions. Analysis of temperature-dependent
<br />ac susceptibility data in the superparamagnetic regime indicates a tendency for dipolar-coupled anticorrelations
<br />of the core moments within the clusters. To resolve the directional correlations between the particle moments
<br />we performed polarized small-angle neutron scattering and determined the magnetic spin-flip cross section
<br />of the powder in low magnetic field at 300 K. We extract the underlying magnetic correlation function of
<br />the magnetization vector field by an indirect Fourier transform of the cross section. The correlation function
<br />suggests nonstochastic preferential alignment between neighboring moments despite thermal fluctuations, with
<br />anticorrelations clearly dominating for next-nearest moments. These tendencies are confirmed by Monte Carlo
<br />simulations of such core clusters.
http://hdl.handle.net/10993/38322
also: http://hdl.handle.net/10993/38326 ; http://hdl.handle.net/10993/41165
10.1103/PhysRevB.98.224420
https://journals.aps.org/prb/abstract/10.1103/PhysRevB.98.224420
FP7 ; 604448 - NANOMAG - Nanometrology Standardization Methods for Magnetic Nanoparticles

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