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Pretty vacancy: The formation energy of Al vacancies in aluminum nitride is decreased by doping with nonmagnetic scandium ions. These vacancies are shown to be the cause of the room‐temperature ferromagnetism in the resulting 1D hexagonal nanoprisms of AlN:Sc (see micrograph), a result that is confirmed by first‐principles calculations. The doping approach provides a new route to dilute magnetic semiconductor...
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