New features of the coercivity in exchange-coupled Ni81Fe19/CoO bilayers

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	New features of the coercivity in exchange-coupled Ni81Fe19/CoO bilayers
	Cai, JW ; Lai, WY
刊名	CHINESE PHYSICS LETTERS
	2001
卷号	18 期号:12 页码:1651
关键词	FERROMAGNETIC-FILMS DEPENDENCE ANISOTROPY ASYMMETRY FIELD MODEL
ISSN号	0256-307X
通讯作者	Cai, JW (reprint author), Chinese Acad Sci, State Key Lab Magnetism, Inst Phys, Beijing 100080, Peoples R China.
中文摘要	The coercivity behaviour of the Ni81Fe19 film exchange-coupled with an antiferromagnetic CoO underlayer has been investigated systematically. It has been found that the coercivity is greatly enhanced not only in the easy axis direction but also in the hard axis direction when the temperature is below the Neel temperature of CoO. Also, the thickness dependence of coercivity at low temperature follows the scaling relation as 1/t(NiFe)(alpha), with alpha = 2.5 at the hard axis, which is quite in contrast with the case of the easy axis, i.e. alpha = 1.5, predicted theoretically and verified experimentally previously. The increase of the temperature leads to the decrease of the coercivity at both the easy and hard axes, but the scaling relations are held except the narrow region just below the Neel temperature of CoO, at which the coercivity varies as 1/t(NiFe)(alpha) with alpha = 1.0 for both the easy and hard axes. Based upon Hoffmann's ripple theory and Malozemoff's random field model, a simple interpretation of the experiment Endings is presented.
收录类别	SCI
语种	英语
公开日期	2013-09-24
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/49843]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Cai, JW,Lai, WY. New features of the coercivity in exchange-coupled Ni81Fe19/CoO bilayers[J]. CHINESE PHYSICS LETTERS,2001,18(12):1651.
APA	Cai, JW,&Lai, WY.(2001).New features of the coercivity in exchange-coupled Ni81Fe19/CoO bilayers.CHINESE PHYSICS LETTERS,18(12),1651.
MLA	Cai, JW,et al."New features of the coercivity in exchange-coupled Ni81Fe19/CoO bilayers".CHINESE PHYSICS LETTERS 18.12(2001):1651.