Conductors and semiconductors usually behave like conduits for fluids of electrons. But sometimes the electrons' spins conspire to produce unconventional behaviours that can be turned off and on with magnets.
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Fisk, Z., von Molnár, S. A metal left spinning. Nature 454, 951–952 (2008). https://doi.org/10.1038/454951a
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DOI: https://doi.org/10.1038/454951a
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