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Dipolar-coupled mom...
Dipolar-coupled moment correlations in clusters of magnetic nanoparticles
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- Bender, P. (författare)
- University of Cantabria, Spain,Univ Cantabria, Fac Sci, Dept CITIMAC, E-39005 Santander, Spain;Univ Luxembourg, L-1511 Luxembourg, Grand Duchy Of, Luxembourg
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- Wetterskog, Erik (författare)
- Uppsala universitet,Fasta tillståndets fysik
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- Honecker, D. (författare)
- Institut Laue-Langevin, France,Inst Laue Langevin, F-38042 Grenoble, France
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- Fock, J. (författare)
- DTU Technical University of Denmark, Denmark,Tech Univ Denmark, DK-2800 Lyngby, Denmark
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- Frandsen, C. (författare)
- DTU Technical University of Denmark, Denmark,Tech Univ Denmark, DK-2800 Lyngby, Denmark
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- Moerland, C. (författare)
- Technische Universiteit Eindhoven, The Netherlands,Tech Univ Eindhoven, Dept Appl Phys, Eindhoven, Netherlands
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- Bogart, L. K. (författare)
- University College London, UK,UCL, UCL Healthcare Biomagnet Lab, 21 Albemarle St, London W1S 4BS, England
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- Posth, O. (författare)
- Physikalisch-Technische Bundesanstalt, Germany,Phys Tech Bundesanstalt, D-10587 Berlin, Germany
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- Szczerba, W. (författare)
- Bundesanstalt für Materialforschung und-prüfung, Germany; AGH University of Science and Technology, Poland,Bundesanstalt Mat Forsch & Prufung, D-12205 Berlin, Germany;AGH Univ Sci & Technol, PL-30059 Krakow, Poland
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- Gavilán, H. (författare)
- Instituto de Ciencia de Materiales de Madrid, Spain,CSIC, ICMM, Madrid, Spain
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- Costo, R. (författare)
- CSIC Instituto de Ciencia de Materiales de Madrid, Spain,CSIC, ICMM, Madrid, Spain
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- Fernández-Díaz, M. T. (författare)
- Institut Laue-Langevin, France,Inst Laue Langevin, F-38042 Grenoble, France
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- González-Alonso, D. (författare)
- University of Cantabria, Spain,Univ Cantabria, Fac Sci, Dept CITIMAC, E-39005 Santander, Spain;Univ Luxembourg, L-1511 Luxembourg, Grand Duchy Of, Luxembourg
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- Fernández Barquín, L. (författare)
- University of Cantabria, Spain,Univ Cantabria, Fac Sci, Dept CITIMAC, E-39005 Santander, Spain;Univ Luxembourg, L-1511 Luxembourg, Grand Duchy Of, Luxembourg
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- Johansson, Christer (författare)
- RISE,Acreo,RISE Acreo, S-40014 Gothenburg, Sweden
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(creator_code:org_t)
- 2018
- 2018
- Engelska.
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Ingår i: Physical Review B. - 2469-9950 .- 2469-9969. ; 98:22
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- Here, we resolve the nature of the moment coupling between 10-nm dimercaptosuccinic acid-coated magnetic nanoparticles. The individual iron oxide cores were composed of >95% maghemite and agglomerated to clusters. At room temperature the ensemble behaved as a superparamagnet according to Mössbauer and magnetization measurements, however, with clear signs of dipolar interactions. Analysis of temperature-dependent ac susceptibility data in the superparamagnetic regime indicates a tendency for dipolar-coupled anticorrelations of the core moments within the clusters. To resolve the directional correlations between the particle moments we performed polarized small-angle neutron scattering and determined the magnetic spin-flip cross section of the powder in low magnetic field at 300 K. We extract the underlying magnetic correlation function of the magnetization vector field by an indirect Fourier transform of the cross section. The correlation function suggests nonstochastic preferential alignment between neighboring moments despite thermal fluctuations, with anticorrelations clearly dominating for next-nearest moments. These tendencies are confirmed by Monte Carlo simulations of such core clusters.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
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Bender, P.
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Wetterskog, Erik
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Honecker, D.
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Fock, J.
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Frandsen, C.
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Moerland, C.
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visa fler...
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Bogart, L. K.
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Posth, O.
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Szczerba, W.
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Gavilán, H.
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Costo, R.
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Fernández-Díaz, ...
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González-Alonso, ...
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Fernández Barquí ...
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Johansson, Chris ...
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