Electronic structure and magnetic properties of sub-3 nm diameter Mn-doped SnO2 nanocrystals and nanowires

被引：41
|
作者：
Sabergharesou, Tahereh [1 ]
Wang, Ting [1 ]
Ju, Ling [1 ]
Radovanovic, Pavle V. [1 ]
机构：
[1] Univ Waterloo, Dept Chem, Waterloo, ON N2L 3G1, Canada
来源：
APPLIED PHYSICS LETTERS | 2013年 / 103卷 / 01期
基金：
加拿大自然科学与工程研究理事会;
关键词：
ROOM-TEMPERATURE; SEMICONDUCTORS; OXIDES; FERROMAGNETISM; SPINTRONICS; TRANSITION;
D O I：
10.1063/1.4813011
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Manganese-doped SnO2 nanocrystals and nanowires with diameters below SnO2 Bohr radius were synthesized by solution methods. X-ray absorption studies reveal that dopant ions are substitutionally incorporated as Mn2+ and Mn3+. Mn2+ is the dominant species at low doping levels, but the fraction of Mn3+ increases with doping concentration. Room-temperature ferromagnetism with the saturation moment of 0.27 mu(B)/Mn is observed for nanocrystalline films containing high fraction of Mn2+ dopant, which is associated with hybridization of Mn2+ d-levels with a donor-impurity band. These results imply the possibility of manipulating magnetic interactions via dopant electronic structure and quantum confinement of the host lattice. (C) 2013 AIP Publishing LLC.
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页数：5
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