Unconventional exchange bias in CoCr2O4/Cr2O3 nanocomposites

doi:10.1063/1.3100036

IMR OpenIR

	Unconventional exchange bias in CoCr2O4/Cr2O3 nanocomposites
	Guo, S.; Liu, X. H.; Cui, W. B.; Liu, W.1; Zhao, X. G.; Li, D.; Zhang, Z. D.
通讯作者	Liu, W.(wliu@imr.ac.cn)
	2009-03-15
发表期刊	JOURNAL OF APPLIED PHYSICS
ISSN	0021-8979
卷号	105 期号:6 页码:3
摘要	Unconventional exchange bias (EB) has been studied in CoCr2O4/Cr2O3 nanocomposites, in which the Curie temperature of the ferrimagnetic CoCr2O4 is much lower than the Neel temperature of the antiferromagnetic Cr2O3. 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 CoCr2O4 nanoparticles has been enhanced significantly by coupling with Cr2O3. 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.
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
资助者	National Natural Science Foundation of China
DOI	10.1063/1.3100036
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[50831006] ; National Natural Science Foundation of China[50331030] ; National Natural Science Foundation of China[50571098]
WOS研究方向	Physics
WOS类目	Physics, Applied
WOS记录号	WOS:000264774000181
出版者	AMER INST PHYSICS
引用统计	被引频次：22[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/97803
专题	中国科学院金属研究所
通讯作者	Liu, W.
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Int Ctr Mat Phys, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Guo, S.,Liu, X. H.,Cui, W. B.,et al. Unconventional exchange bias in CoCr2O4/Cr2O3 nanocomposites[J]. JOURNAL OF APPLIED PHYSICS,2009,105(6):3.
APA	Guo, S..,Liu, X. H..,Cui, W. B..,Liu, W..,Zhao, X. G..,...&Zhang, Z. D..(2009).Unconventional exchange bias in CoCr2O4/Cr2O3 nanocomposites.JOURNAL OF APPLIED PHYSICS,105(6),3.
MLA	Guo, S.,et al."Unconventional exchange bias in CoCr2O4/Cr2O3 nanocomposites".JOURNAL OF APPLIED PHYSICS 105.6(2009):3.