What is it about?

The impact of the nanoparticle assembly on the properties by increasing the volume fraction of the inorganic magnetic phase has been investigated via cluster-like nanoparticle assemblies. ac/dc susceptibility, Mossbauer spectroscopy and Monte Carlo simulations of maghemite nanoclusters identify room-temperature ferrimagnetism and corroborate the role of inter-particle dipolar interactions for the superspin glass state, which precedes a surface spin-freezing process at lower-temperatures.

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Why is it important?

This study illustrates how the knowledge and contribution of the different length-scale microscopic mechanisms are crucial for the development of technologically useful nanoparticle assemblies. Designing such materials with optimum characteristics may address particular magnetically-driven applications, such as, in MRI diagnostics, hyperthermia treatment or memory technologies.

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This page is a summary of: Assembly-mediated interplay of dipolar interactions and surface spin disorder in colloidal maghemite nanoclusters, Nanoscale, January 2014, Royal Society of Chemistry,
DOI: 10.1039/c3nr06103e.
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