Quantum competitions between the effects of the interlayer exchange couplings and the magnetically structural symmetry in a four-layer ferrimagnetic superlattice
文献类型：期刊论文
| 作者 | R. K. Qiu ; Z. D. Zhang ; L. Q. Guo |
| 刊名 | Journal of Magnetism and Magnetic Materials
 |
| 出版日期 | 2008 |
| 卷号 | 320期号:16页码:2121-2131 |
| 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 |
| ISSN号 | 0304-8853 |
| 中文摘要 | 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. |
| 原文出处 | |
| 公开日期 | 2012-04-13 |
| 源URL | [http://210.72.142.130/handle/321006/33056]  |
| 专题 | 金属研究所_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. |
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来源：金属研究所
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