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We report magnetic measurements on a macroscopic three-dimensional fcc array of iron-oxide nanoparticles. We observe typical nanomagnetism for the randomly packed configuration of nanoparticles, including dynamical freezing and superparamagnetism. By contrast, the nanoparticle “atoms” in the fcc configuration that form the crystal exhibit a low coercivity that is weakly temperature dependent with no superparamagnetism up to 400 K.
|Translated title of the contribution||Novel Aspects of Magnetic Interactions in a Macroscopic 3D Nanoparticle-Based Crystal|
|Number of pages||4|
|Journal||Physical Review Letters|
|Publication status||Published - 2010|