Unconventional exchange bias in CoCr(2)O(4)/Cr(2)O(3) nanocomposites

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	Unconventional exchange bias in CoCr(2)O(4)/Cr(2)O(3) nanocomposites
	S. Guo; X. H. Liu; W. B. Cui; W. Liu; X. G. Zhao; D. Li; Z. D. Zhang
	2009
发表期刊	Journal of Applied Physics
ISSN	0021-8979
卷号	105 期号:6
摘要	Unconventional exchange bias (EB) has been studied in CoCr(2)O(4)/Cr(2)O(3) nanocomposites, in which the Curie temperature of the ferrimagnetic CoCr(2)O(4) is much lower than the Neel temperature of the antiferromagnetic Cr(2)O(3). A negative EB field of about 2.5 kOe at 5 K is achieved upon cooling in a field of 30 kOe. Meanwhile, the coercivity of the CoCr(2)O(4) nanoparticles has been enhanced significantly by coupling with Cr(2)O(3). The effect of the cooling field on the EB field and coercivity at 10 K has also been investigated. The domain-state model is used to interpret the unconventional EB. Cooling field may play a decisive role in the creation of the interfacial spin configuration for the unconventional EB, not only by exchange interaction between the induced magnetization of a polarized paramagnet and interfacial spins of an antiferromagnet but also by Zeeman interaction between the domain-state surplus magnetization and the external field.
部门归属	[liu, w.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. chinese acad sci, inst met res, int ctr mat phys, shenyang 110016, peoples r china.;liu, w (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china;wliu@imr.ac.cn
关键词	Antiferromagnetic Materials Chromium Compounds Cobalt Compounds Coercive Force Curie Temperature Exchange Interactions (Electron) Ferrimagnetic Materials Interface Magnetism Magnetic Domains Magnetic Particles Nanocomposites Nanoparticles Neel Temperature Paramagnetic Materials Zeeman Effect Ferromagnet/antiferromagnet Bilayers Films Model Nanostructures Coercivity Interfaces Anisotropy State
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文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/31937
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	S. Guo,X. H. Liu,W. B. Cui,et al. Unconventional exchange bias in CoCr(2)O(4)/Cr(2)O(3) nanocomposites[J]. Journal of Applied Physics,2009,105(6).
APA	S. Guo.,X. H. Liu.,W. B. Cui.,W. Liu.,X. G. Zhao.,...&Z. D. Zhang.(2009).Unconventional exchange bias in CoCr(2)O(4)/Cr(2)O(3) nanocomposites.Journal of Applied Physics,105(6).
MLA	S. Guo,et al."Unconventional exchange bias in CoCr(2)O(4)/Cr(2)O(3) nanocomposites".Journal of Applied Physics 105.6(2009).