Abstract
Prussian blue analogues (PBA) ferromagnetic nanoparticles CsI x NiII[CrIII(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.
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Ridier, K., Gillon, B., Chaboussant, G. et al. Individual-collective crossover driven by particle size in dense assemblies of superparamagnetic nanoparticles. Eur. Phys. J. B 90, 77 (2017). https://doi.org/10.1140/epjb/e2017-70534-9
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DOI: https://doi.org/10.1140/epjb/e2017-70534-9