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Chin. Phys. B, 2012, Vol. 21(7): 078101    DOI: 10.1088/1674-1056/21/7/078101
INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY Prev   Next  

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
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.
Keywords:  nanocrystalline materials      antiferromagnetics      spin glass      exchange bias  
Received:  23 November 2011      Revised:  19 December 2011      Accepted manuscript online: 
PACS:  81.07.Bc (Nanocrystalline materials)  
  75.50.Ee (Antiferromagnetics)  
  75.50.Lk (Spin glasses and other random magnets)  
  75.30.Et (Exchange and superexchange interactions)  
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

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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