The synthesis and exchange bias effect of monodisperse NiO nanocrystals

doi:10.1088/1674-1056/21/7/078101

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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The synthesis and exchange bias effect of monodisperse NiO nanocrystals

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