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Individual-collective crossover driven by particle size in dense assemblies of superparamagnetic nanoparticles

Author

Listed:
  • Karl Ridier

    (Laboratoire Léon Brillouin, UMR12 CEA-CNRS)

  • Béatrice Gillon

    (Laboratoire Léon Brillouin, UMR12 CEA-CNRS)

  • Grégory Chaboussant

    (Laboratoire Léon Brillouin, UMR12 CEA-CNRS)

  • Laure Catala

    (Institut de Chimie Moléculaire et des Matériaux d’Orsay, CNRS, Université Paris Sud 11)

  • Sandra Mazérat

    (Institut de Chimie Moléculaire et des Matériaux d’Orsay, CNRS, Université Paris Sud 11)

  • Eric Rivière

    (Institut de Chimie Moléculaire et des Matériaux d’Orsay, CNRS, Université Paris Sud 11)

  • Talal Mallah

    (Institut de Chimie Moléculaire et des Matériaux d’Orsay, CNRS, Université Paris Sud 11)

Abstract

Prussian blue analogues (PBA) ferromagnetic nanoparticles Cs I x Ni II [Cr III (CN)6 ] z ·3(H2O) embedded in CTA+ (cetyltrimethylammonium) matrix have been investigated by magnetometry and magnetic small-angle neutron scattering (SANS). Choosing particle sizes (diameter D = 4.8 and 8.6 nm) well below the single-domain radius and comparable volume fraction of particle, we show that the expected superparamagnetic regime for weakly anisotropic isolated magnetic particles is drastically affected due to the interplay of surface/volume anisotropies and dipolar interactions. For the smallest particles (D = 4.8 nm), magnetocrystalline anisotropy is enhanced by surface spins and drives the system into a regime of ferromagnetically correlated clusters characterized by a temperature-dependent magnetic correlation length L mag which is experimentally accessible using magnetic SANS. For D = 8.6 nm particles, a superparamagnetic regime is recovered in a wide temperature range. We propose a model of interacting single-domain particles with axial anisotropy that accounts quantitatively for the observed behaviors in both magnetic regimes.

Suggested Citation

  • Karl Ridier & Béatrice Gillon & Grégory Chaboussant & Laure Catala & Sandra Mazérat & Eric Rivière & Talal Mallah, 2017. "Individual-collective crossover driven by particle size in dense assemblies of superparamagnetic nanoparticles," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 90(4), pages 1-9, April.
    • Handle: RePEc:spr:eurphb:v:90:y:2017:i:4:d:10.1140_epjb_e2017-70534-9
    DOI: 10.1140/epjb/e2017-70534-9
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    Keywords

    Mesoscopic and Nanoscale Systems;

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