The coexistence of spin order and disorder at a critical point in the phase diagram of multiferroic materials may be exploited to locally control magnetoelectric coupling — as is now shown for doped BiFeO3 by means of scanning probe microscopy.
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Kalinin, S. Making a point of control. Nature Phys 13, 115–116 (2017). https://doi.org/10.1038/nphys4033
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DOI: https://doi.org/10.1038/nphys4033