A systematic study on the magnetic and electrical transport properties of single-phase wurtzite Zn1-x Cux O is performed. Efros variable range hopping dominates the conduction, which is accompanied by a ferromagnetic order up to 700 K for x>1%. Both the first-principles calculations and Cu/Al co-doping experiments suggest that the spontaneous spin polarization originates from the p- d exchange interaction between O 2p and Cu3d orbitals. Furthermore, our results are consistent with the scenario that the intrinsic ferromagnetism is established through indirect interassctions between bound magnetic polarons mediated by magnetic impurities.
|Original language||English (US)|
|Journal||Applied Physics Letters|
|State||Published - Apr 18 2011|
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)