Analytical studies on holographic superconductors in Gauss-Bonnet gravity

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	Analytical studies on holographic superconductors in Gauss-Bonnet gravity
	Li, HF ; Cai, RG ; Zhang, HQ
刊名	JOURNAL OF HIGH ENERGY PHYSICS
	2011
期号	4
关键词	BLACK-HOLES
ISSN号	1126-6708
通讯作者	Li, HF: Shanxi Datong Univ, Dept Phys, Datong 037009, Peoples R China.
中文摘要	In this paper, the nucleation field H(N), hysteresis loops, and coercivity mechanism for hard/soft multilayers have been investigated within a self-contained micromagnetic model, which change with the strength of the interface exchange coupling J(i) as well as the thickness of the hard and soft layers L h and L(s). Analyses show that the nucleation field goes up as the interface exchange coupling increases. However, J(i) has a significant effect on HN only when L(s) is about 10% of the domain wall width of the soft phase while the thickness of the hard layer is larger than its domain wall width. The hysteresis loops of the Nd(2)Fe(14)B/alpha-Fe/Nd(2)Fe(14)B trilayers for various J(i) have been calculated. The calculated pinning field decreases when J(i) increases. It is found that, as L(s) increases, the coercivity mechanism changes from pinning to nucleation. The change of exchange coupling at the interface influences the soft layer thickness, at which the coercivity starts to deviate from pinning. The critical thickness of the soft phase, at which the behavior of the hysteresis loop changes from the single-phased one to the two-phased one, decreases as J(i) decreases, so that the "rigid composite magnet" appears only when L(s) is very small for smaller J(i). (C) 2011 American Institute of Physics. [doi:10.1063/1.3562973]
收录类别	SCI
资助信息	National Natural Science Foundation of China [10821504, 10975168, 11035008, 11075098]; Ministry of Science and Technology of China [2010CB833004]
语种	英语
公开日期	2013-09-17
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/33728]
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	Li, HF,Cai, RG,Zhang, HQ. Analytical studies on holographic superconductors in Gauss-Bonnet gravity[J]. JOURNAL OF HIGH ENERGY PHYSICS,2011(4).
APA	Li, HF,Cai, RG,&Zhang, HQ.(2011).Analytical studies on holographic superconductors in Gauss-Bonnet gravity.JOURNAL OF HIGH ENERGY PHYSICS(4).
MLA	Li, HF,et al."Analytical studies on holographic superconductors in Gauss-Bonnet gravity".JOURNAL OF HIGH ENERGY PHYSICS .4(2011).