期刊
CHEMISTRY OF MATERIALS
卷 24, 期 9, 页码 1676-1681出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm203661c
关键词
dilute magnetic semiconductor; surface modification; X-ray absorption spectroscopy
资金
- Academy of Sciences [KJCX2-YW-N42]
- National Natural Science Foundation of China [10734070, 11005145, 20901055]
- National Basic Research Program of China [2009CB930804, 2012CB825800]
- NSRL [20090622S]
In this research, Mn-doped ZnO nanorods were synthesized by a solvothermal method and their magnetic behavior was tuned from paramagnetism to ferromagnetism via a change in their surface environment. The structure and electronic configuration of Mn ions were investigated by means of X-ray diffraction and X-ray absorption fine structure to understand the surface-controlled magnetic properties. The surface electronic configuration was studied by Mn L-3,L-2-edge XANES, which were simulated using the ligand field multiplet theory and the ligand-to-metal charge transfer effects. The results pointed out that Mn3+ ions occupy distorted tetrahedronal sites near the surface region and different surface modifications produce changes in the Mn 3d-anion p hybridization strength. A midgap state with strong O-2p character has been also recognized at the O K-edge XANES, and the density of such a state is strongly related to the observed ferromagnetism. This research represents a novel promising route for tuning the magnetic behavior of nano-dilute magnetic semiconductor systems via surface atomic changes.
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