Dynamic properties of spin cluster glass and the exchange bias effect in BiFeO(3) nanocrystals

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	Dynamic properties of spin cluster glass and the exchange bias effect in BiFeO(3) nanocrystals
	S. N. Dong; Y. P. Yao; Y. Hou; Y. K. Liu; Y. Tang; X. G. Li
	2011
发表期刊	Nanotechnology
ISSN	0957-4484
卷号	22 期号:38
摘要	A spin cluster glass behavior and a complicated exchange bias effect are observed in high quality BiFeO(3) nanocrystals grown by a hydrothermal method. The dynamic properties of the spin clusters investigated by measuring the frequency dependences of ac susceptibility show that the relaxation process can be described using a power law with the glass transition temperature T(g) = 57 K, relaxation time constant tau(0) = 4.4 x 10(-10) s, and critical exponent zv = 10.3 +/- 1.9, consistent with a three-dimensional Ising spin glass. The exchange bias field (H(EB)) varies non-monotonically with temperature and achieves a minimum at T(g). The abnormal shift of hysteresis loops above T(g) may be interpreted in terms of a Malozemoff's random-field model with a framework of antiferromagnetic core/spin-cluster shell structure and a two-dimensional diluted antiferromagnet in a field (2D-DAFF) model, respectively. The exchange anisotropy of the BiFeO(3) nanocrystals will shed light on a possible application for magnetism related nanosized devices.
部门归属	[dong, sining; yao, yiping; hou, ying; liu, yukuai; tang, yang; li, xiaoguang] univ sci & technol china, dept phys, hefei natl lab phys sci microscale, hefei 230026, peoples r china. [li, xiaoguang] acad sinica, int ctr mat phys, shenyang 110015, peoples r china.;li, xg (reprint author), univ sci & technol china, dept phys, hefei natl lab phys sci microscale, hefei 230026, peoples r china;lixg@ustc.edu.cn
关键词	Random-field Model Multiferroic Bifeo3 Magnetic-properties Thin-films Bismuth Ferrite Temperature Anisotropy Nanoparticles Transition Dependence
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/30307
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	S. N. Dong,Y. P. Yao,Y. Hou,et al. Dynamic properties of spin cluster glass and the exchange bias effect in BiFeO(3) nanocrystals[J]. Nanotechnology,2011,22(38).
APA	S. N. Dong,Y. P. Yao,Y. Hou,Y. K. Liu,Y. Tang,&X. G. Li.(2011).Dynamic properties of spin cluster glass and the exchange bias effect in BiFeO(3) nanocrystals.Nanotechnology,22(38).
MLA	S. N. Dong,et al."Dynamic properties of spin cluster glass and the exchange bias effect in BiFeO(3) nanocrystals".Nanotechnology 22.38(2011).

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