Quantum competitions between the effects of the interlayer exchange couplings and the magnetically structural symmetry in a four-layer ferrimagnetic superlattice

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	Quantum competitions between the effects of the interlayer exchange couplings and the magnetically structural symmetry in a four-layer ferrimagnetic superlattice
	R. K. Qiu; Z. D. Zhang; L. Q. Guo
	2008
发表期刊	Journal of Magnetism and Magnetic Materials
ISSN	0304-8853
卷号	320 期号:16 页码:2121-2131
摘要	The magnon energy spectra, the sublayer magnetization and the quantum fluctuations in a ferrimagnetic superlattice consisting of four different magnetic sublayers are studied by employing the linear spin-wave approach and Green's function technique. The effects of the interlayer exchange couplings and the spin quantum numbers on the sublayer magnetization and the quantum fluctuations of the systems are discussed for three different spin configurations. The roles of quantum competitions among the interlayer exchange couplings and the symmetry of the different spin configurations have been understood. The magnetizations of some sublayers increase monotonously, while those of others can exhibit their maximum, and the quantum fluctuations of the whole superlattice system can show a minimum when one of the antiferromagnetic interlayer exchange couplings increases. This is due to the quantum competition/transmission of effects of the interlayer exchange couplings. When the spin quantum number of sublayers varies, the system goes through from a quantum region of small spin numbers to a classical region of large spin numbers. The quantum fluctuations of the system exhibit a maximum as a function of the spin quantum number of a sublayer, which is related with higher symmetry of the system. It belongs to the type III Shubnikov group of magnetic groups. This magnetically structural symmetry consists of not only the symmetry of space group, but also the symmetry of the direction and strength of spins. (C) 2008 Elsevier B.V. All rights reserved.
部门归属	[qiu, rong-ke; guo, lian-quan] shenyang univ technol, shenyang 110023, peoples r china. [qiu, rong-ke; zhang, zhi-dong] chinese acad sci, shenyang natl lab mat sci, met res & int ctr mat phys, shenyang 110016, peoples r china.;qiu, rk (reprint author), shenyang univ technol, shenyang 110023, peoples r china;rkqiu@163.com
关键词	Layered Ferrimagnetic Superlattice Interlayer And Intralayer Exchange Coupling Sublayer Magnetization Quantum Fluctuation Quantum Competition Magnetically Structural Symmetry Of The System Spin-wave Spectrum Heisenberg Ferrimagnets Phase-transitions Magnetization Ferromagnet Energy Magnetoresistance Dependence Crystal Gap
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WOS记录号	WOS:000256100100009
引用统计	被引频次：7[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/321006/33056
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	R. K. Qiu,Z. D. Zhang,L. Q. Guo. Quantum competitions between the effects of the interlayer exchange couplings and the magnetically structural symmetry in a four-layer ferrimagnetic superlattice[J]. Journal of Magnetism and Magnetic Materials,2008,320(16):2121-2131.
APA	R. K. Qiu,Z. D. Zhang,&L. Q. Guo.(2008).Quantum competitions between the effects of the interlayer exchange couplings and the magnetically structural symmetry in a four-layer ferrimagnetic superlattice.Journal of Magnetism and Magnetic Materials,320(16),2121-2131.
MLA	R. K. Qiu,et al."Quantum competitions between the effects of the interlayer exchange couplings and the magnetically structural symmetry in a four-layer ferrimagnetic superlattice".Journal of Magnetism and Magnetic Materials 320.16(2008):2121-2131.