Certain bacteria contain strings of magnetic nanoparticles and therefore align with magnetic fields. Inspired by these natural structures, researchers have now fabricated synthetic one-dimensional arrays of such particles.
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Faivre, D., Bennet, M. Magnetic nanoparticles line up. Nature 535, 235–236 (2016). https://doi.org/10.1038/535235a
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DOI: https://doi.org/10.1038/535235a