Activation of High-T C Ferromagnetism in Mn2+-Doped ZnO using Amines

We report the discovery that high-T C ferromagnetism in manganese-doped ZnO (Mn2+:ZnO) can be activated by amine binding and calcination. The activation of ferromagnetism is attributed to the incorporation of uncompensated p-type dopants into the ZnO lattice upon amine calcination, a process that ha...

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Published in:Journal of the American Chemical Society 2005-04, Vol.127 (15), p.5292-5293
Main Authors: Kittilstved, Kevin R, Gamelin, Daniel R
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Gamelin, Daniel R
description We report the discovery that high-T C ferromagnetism in manganese-doped ZnO (Mn2+:ZnO) can be activated by amine binding and calcination. The activation of ferromagnetism is attributed to the incorporation of uncompensated p-type dopants into the ZnO lattice upon amine calcination, a process that has substantial precedence in the literature surrounding p-type ZnO. The experimental observations are consistent with a microscopic mechanism involving formation of bound magnetic polarons upon introduction of p-type dopants into Mn2+:ZnO. These results clearly demonstrate that Mn2+:ZnO ferromagnetism is critically sensitive to defects other than the magnetic dopants themselves, offering some insight into the diversity of experimental observations reported previously for this material.
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title Activation of High-T C Ferromagnetism in Mn2+-Doped ZnO using Amines
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