Temperature dependence of the resonant exchange coupling between two ferromagnets separated by a nonmetallic spacer

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	Temperature dependence of the resonant exchange coupling between two ferromagnets separated by a nonmetallic spacer
	Wang, JZ ; Li, BZ ; Hu, ZN
刊名	PHYSICAL REVIEW B
	2000
卷号	62 期号:10 页码:6570
关键词	FE/SI MULTILAYERS MAGNETIC MULTILAYERS FE/FESI MULTILAYERS 2 FERROMAGNETS INTERLAYER SEMICONDUCTOR SANDWICHES THICKNESS MECHANISM LAYERS
ISSN号	0163-1829
通讯作者	Wang, JZ (reprint author), Chinese Acad Sci, Inst Phys, POB 603-12, Beijing 100080, Peoples R China.
中文摘要	By considering the quantum-size effect arising from ferromagnets (FM) thickness and the interference of tunneling electrons in an FM layer, we have investigated the bilinear coupling (J(1)) and the intrinsic biquadratic coupling (J(2)) between two FM's separated by a nonmetallic spacer. It is found that both J(1) and J(2) are decreasing oscillatory functions of FM thickness with many sharp resonant peaks. Near these peaks, the strengths of J(1) and J(2) have negative temperature coefficients. In striking contrast, in the region of nonresonant coupling, the thermal excitations of conduction electrons tend to enhance the antiferromagnetic coupling, but suppress the FM one, and make J(2) oscillate in sign with the increasing temperature. In addition, we also find that a nonmonotonous temperature coefficient of J(1) can be derived by lowering the barrier height to some extent. The calculation about the density of states (DOS) indicates that these different thermal features are related to the relative magnitudes of DOS above Fermi surface between the parallel and antiparallel alignments of FM's. Therefore the present paper provides a feasible explanation for the recent experimental observations.
收录类别	SCI
语种	英语
公开日期	2013-09-23
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/44781]
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	Wang, JZ,Li, BZ,Hu, ZN. Temperature dependence of the resonant exchange coupling between two ferromagnets separated by a nonmetallic spacer[J]. PHYSICAL REVIEW B,2000,62(10):6570.
APA	Wang, JZ,Li, BZ,&Hu, ZN.(2000).Temperature dependence of the resonant exchange coupling between two ferromagnets separated by a nonmetallic spacer.PHYSICAL REVIEW B,62(10),6570.
MLA	Wang, JZ,et al."Temperature dependence of the resonant exchange coupling between two ferromagnets separated by a nonmetallic spacer".PHYSICAL REVIEW B 62.10(2000):6570.