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

Karl Ridier, Béatrice Gillon, Grégory Chaboussant (), Laure Catala, Sandra Mazérat, Eric Rivière and Talal Mallah
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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

The European Physical Journal B: Condensed Matter and Complex Systems, 2017, vol. 90, issue 4, 1-9

Abstract: 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.

Keywords: Mesoscopic; and; Nanoscale; Systems (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1140/epjb/e2017-70534-9

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