The synthesis and exchange bias effect of monodisperse NiO nanocrystals

Monodisperse NiO nanocrystals with an average particle size of 3 -h 0.4 nm are successfully synthesized by the thermal decomposition of Ni-oleylamine complex in an organic solvent under a continuous 02 flux. The crystalline structure and the morphology of the product are investigated by X-ray diffra...

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Bibliographic Details
Published in	Chinese physics B Vol. 21; no. 7; pp. 536 - 540
Main Author	段寒凝袁松柳郑先锋田召明
Format	Journal Article
Language	English
Published	01.07.2012
Subjects	Antiferromagnetism Bias Diffraction Exchange Magnetization Nanocrystals Nickel Solvents X-rays X射线光电子能谱仪 X射线衍射仪交换偏置场单分散合成氧化镍纳米晶体透射电子显微镜
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ISSN	1674-1056 2058-3834 1741-4199
DOI	10.1088/1674-1056/21/7/078101

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Summary:	Monodisperse NiO nanocrystals with an average particle size of 3 -h 0.4 nm are successfully synthesized by the thermal decomposition of Ni-oleylamine complex in an organic solvent under a continuous 02 flux. The crystalline structure and the morphology of the product are investigated by X-ray diffraction, X-ray photoelectron spectroscopy, and transmission electron microscopy. Magnetization and alternating-current （ac） susceptibility measurements indicate that the structure of the particles can be considered as consisting of an antiferromagnetieally 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 field cooling. This observed exchange bias effect is explained in terms of the exchange interaction between the antiferromagnetie core and the spin-glass-like shell.
Bibliography:	Duan Han-Ning, Yuan Song-Liu, Zheng Xian-Feng and Tian Zhao-Ming School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China nanocrystalline materials, antiferromagnetics, spin glass, exchange bias 11-5639/O4 Monodisperse NiO nanocrystals with an average particle size of 3 -h 0.4 nm are successfully synthesized by the thermal decomposition of Ni-oleylamine complex in an organic solvent under a continuous 02 flux. The crystalline structure and the morphology of the product are investigated by X-ray diffraction, X-ray photoelectron spectroscopy, and transmission electron microscopy. Magnetization and alternating-current （ac） susceptibility measurements indicate that the structure of the particles can be considered as consisting of an antiferromagnetieally 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 field cooling. This observed exchange bias effect is explained in terms of the exchange interaction between the antiferromagnetie core and the spin-glass-like shell. ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1674-1056 2058-3834 1741-4199
DOI:	10.1088/1674-1056/21/7/078101