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The synthesis and exchange bias effect of monodisperse NiO nanocrystals |
Duan Han-Ning(段寒凝), Yuan Song-Liu(袁松柳)†, Zheng Xian-Feng(郑先锋), and Tian Zhao-Ming(田召明) |
School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China |
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Abstract Monodisperse NiO nanocrystals with an average particle size of 3? 0.4 nm are successfully synthesized by the thermal decomposition of Ni-oleylamine complex in an organic solvent under a continuous O2 flux. The crystalline structure and the morphology of the product are investigated by X-ray diffraction, X-ray photoelectron spectroscopy, and transmission electron microscope. Magnetization and alternating-current (ac) susceptibility measurements indicate that the structure of the particles can be considered as consisting of an antiferromagnetically ordered core and a spin-glass like surface shell. In addition, both the exchange bias field and the vertical magnetization shift can be observed in this system at 10 K after the field cooling. This observed exchange bias effect is explained in terms of the exchange interaction between the antiferromagnetic core and the spin-glass like shell.
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Received: 23 November 2011
Revised: 19 December 2011
Accepted manuscript online:
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PACS:
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81.07.Bc
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(Nanocrystalline materials)
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75.50.Ee
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(Antiferromagnetics)
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75.50.Lk
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(Spin glasses and other random magnets)
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75.30.Et
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(Exchange and superexchange interactions)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11174092). |
Corresponding Authors:
Yuan Song-Liu
E-mail: yuansl@hust.edu.cn
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Cite this article:
Duan Han-Ning(段寒凝), Yuan Song-Liu(袁松柳), Zheng Xian-Feng(郑先锋), and Tian Zhao-Ming(田召明) The synthesis and exchange bias effect of monodisperse NiO nanocrystals 2012 Chin. Phys. B 21 078101
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