The degree of atomic ordering in magnetic nanoparticles decreases strongly with the particles' size. The origin of such a phenomenon has been determined by high-resolution transmission electron microscopy and tomography, which shows how correct heat treatment can lead to atomic order also in very small nanoparticles.
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Sato, K. When atoms move around. Nature Mater 8, 924–925 (2009). https://doi.org/10.1038/nmat2575
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DOI: https://doi.org/10.1038/nmat2575
