Spin waves in several Heisenberg systems: Three-sublattice with different exchange constants (J(ab)=J(bc)not equal J(ca)) and a superlattice with the elementary unit of four or three different layers
文献类型：期刊论文
| 作者 | Z. D. Zhang |
| 刊名 | Physical Review B
 |
| 出版日期 | 1997 |
| 卷号 | 55期号:18页码:12408-12423 |
| 关键词 | ferromagnetic superlattices reorientation transitions magnetic superlattices modes temperatures film |
| ISSN号 | 0163-1829 |
| 中文摘要 | The quadratic Holstein-Primakoff spin-wave Hamiltonian for three-sublattice Heisenberg systems with different exchange constants (J(ab)=J(bc)not equal J(ca)) was diagonalized by a three-step procedure. The classical ground state was examined and the effects of quantum fluctuation on the ground state were discussed. The 0 K spin reorientation angles due to quantum fluctuations were found to originate from the asymmetry of the system. As an extended application of the spin-wave study of the multisublattice systems, the spin-wave spectra of a Heisenberg superlattice, which has four or three magnetic atoms or spins, in each magnetic unit cell in the x direction, were solved analytically in terms of creation and annihilation operators. It has been found that the spin-wave spectra of the present superlattice systems depend on the exchange constants J and J(1), and that the degeneracy of the spin-wave spectra remains for the superlattice of four atomic layers and is partially removed for the superlattice of three atomic layers mainly due to the asymmetry of the system. Another type of splitting of the energy level occurs which differs for those levels with different degeneracies. The mixing of the interface and the bulk modes were found for the spin-wave dispersion of the superlattices. It was predicted that even for different superlattices having the same exchange constants (either J or J'), i.e., without the oscillation of the exchange coupling, the asymmetry can lead to the oscillation of magnetic properties, such as magnetization and giant magnetoresistance. |
| 原文出处 | |
| 公开日期 | 2012-04-14 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/38214]  |
| 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 | Z. D. Zhang. Spin waves in several Heisenberg systems: Three-sublattice with different exchange constants (J(ab)=J(bc)not equal J(ca)) and a superlattice with the elementary unit of four or three different layers[J]. Physical Review B,1997,55(18):12408-12423. |
| APA | Z. D. Zhang.(1997).Spin waves in several Heisenberg systems: Three-sublattice with different exchange constants (J(ab)=J(bc)not equal J(ca)) and a superlattice with the elementary unit of four or three different layers.Physical Review B,55(18),12408-12423. |
| MLA | Z. D. Zhang."Spin waves in several Heisenberg systems: Three-sublattice with different exchange constants (J(ab)=J(bc)not equal J(ca)) and a superlattice with the elementary unit of four or three different layers".Physical Review B 55.18(1997):12408-12423. |
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来源：金属研究所
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