期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 114, 期 39, 页码 16191-16196出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp1036553
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资金
- National Science Council of Taiwan [NSC 98-2120-M-006-004, NSC 98-2119-M-006-006]
The microstructure, growth mechanism, and ferromagnetic (FM)/antiferromagnetic (ARM) coupling have been discussed in Ni:ZnO nanorod/Zn:NiO nanowall composite structures. The composite structures were synthesized by a hydrothermal method at 90 degrees C. A systematic investigation of high-resolution transmission electron microscopy, X-ray absorption spectroscopy, and magnetization studies reveals that the as-synthesized product shows FM behavior at room temperature, whereas the annealed sample shows mixed (FM/AFM) magnetic behavior. A detectable magnetic exchange coupling between FM/AFM has been demonstrated by magnetization measurements in the annealed products. The observed room-temperature FM behavior in these nanostructures was interpreted in terms of bound magnetic polarons.
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