Collective Magnetic Properties in Nanoparticle Assembled Systems

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.