Magnetic behaviour of negatively charged nickel(II) hexacyanoferrate(III) coordination nanoparticles

Negatively charged 4 nm bimetallic NiII–FeIII cyanide-bridged nanoparticles were obtained and isolated by different coating agents. The magnetic properties of the particles were studied in the powder form and in diluted samples. A spin-glass like behaviour occurs in the concentrated sample, while the magnetic behaviour of the diluted ones strongly depends on the method used to isolate the nanoparticles. Only high dilution in a polymer matrix leads to a single-domain superparamagnetic behaviour, with a blocking temperature of 3.5 K.

Graphical abstractNegatively charged 4 nm bimetallic NiII–FeIII cyanide-bridged coordination nanoparticles were isolated by different coating agents. The magnetic properties of the nanoparticles are found to be directly related to the dilution process. A single domain magnetic behaviour with almost no dipolar interaction is observed only when the particles are highly diluted in a polymer matrix.Figure optionsDownload full-size imageDownload as PowerPoint slide