Article (Scientific journals)
Dipolar-coupled moment correlations in clusters of magnetic nanoparticles
Bender, Philipp Florian; Wetterskog, E.; Honecker, Dirk et al.
2018In Physical Review. B, Condensed Matter, 98, p. 224420
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Abstract :
[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.
Disciplines :
Physics
Author, co-author :
Bender, Philipp Florian ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Wetterskog, E.
Honecker, Dirk ;  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.
More authors (5 more) Less
External co-authors :
yes
Language :
English
Title :
Dipolar-coupled moment correlations in clusters of magnetic nanoparticles
Publication date :
2018
Journal title :
Physical Review. B, Condensed Matter
ISSN :
1095-3795
Publisher :
American Physical Society, New York, United States - Maryland
Volume :
98
Pages :
224420
Peer reviewed :
Peer Reviewed verified by ORBi
Focus Area :
Physics and Materials Science
European Projects :
FP7 - 604448 - NANOMAG - Nanometrology Standardization Methods for Magnetic Nanoparticles
Funders :
CE - Commission Européenne [BE]
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