Abstract
We report experimentally measured magnetic static and dynamic responses of ferrofluid samples specially enriched with highly magnetically interacting nanoparticles. In order to investigate the role of microstructural transformations caused by these interactions, magnetic properties of the systems were measured in a broad temperature range: cooling was performed from 340 to 230 K. Unusual magnetic properties suggest the low-temperature formation of highly correlated magnetically passive clusters, whose relaxations are very slow. This self-assembly is reinforced if the concentration of magnetic nanoparticles increases.
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