Spin waves at low temperatures in two-sublattice Heisenberg ferromagnets and ferrimagnets with different sublattice anisotropies
文献类型：期刊论文
| 作者 | Z. D. Zhang ; T. Zhao |
| 刊名 | Journal of Physics-Condensed Matter
 |
| 出版日期 | 1997 |
| 卷号 | 9期号:38页码:8101-8118 |
| 关键词 | reorientation transitions magnetization process model magnetism antiferromagnet |
| ISSN号 | 0953-8984 |
| 中文摘要 | The Hamiltonian for two-sublattice Heisenberg ferromagnets and ferrimagnets with different sublattice anisotropies, which is applicable for rare-earth-transition-metal (R-T) intermetallics, is established. In order to study spin-waves in easy plane or easy cone configuration, a transformation of spin-vector coordinates is performed by rotating the quantization axis frame by Eulerian angles and accordingly the Hamiltonian. Spin-wave spectra at low temperatures of the present system are determined by performing the standard Holstein-Primakoff transformation and a four-step diagonalizing procedure consisting of two coupled Cullen transformations, an extended Bogoliubov transformation, two independent Bogoliubov transformations and two independent Holstein-Primakoff transformations. The results for the ground states of the easy axis, the easy plane and the easy cone configurations are compared with those obtained by the mean-field theory. The border lines between the different spin structures are derived in either the purr classical limit or the large-exchange limit. Continuous transitions, accompanied with the continuous change of the angle between the averaged sublattice magnetizations, are found in both cases. It is found that splittings of the spin-wave spectra of the two-sublattice Heisenberg ferromagnets or ferrimagnets exist. A gap can appear in the spin-wave spectra, depending on the competition among the exchange and the anisotropies. Other physical properties, such as sublattice magnetization and specific heat, are discussed also. |
| 原文出处 | |
| 公开日期 | 2012-04-14 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/38216]  |
| 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,T. Zhao. Spin waves at low temperatures in two-sublattice Heisenberg ferromagnets and ferrimagnets with different sublattice anisotropies[J]. Journal of Physics-Condensed Matter,1997,9(38):8101-8118. |
| APA | Z. D. Zhang,&T. Zhao.(1997).Spin waves at low temperatures in two-sublattice Heisenberg ferromagnets and ferrimagnets with different sublattice anisotropies.Journal of Physics-Condensed Matter,9(38),8101-8118. |
| MLA | Z. D. Zhang,et al."Spin waves at low temperatures in two-sublattice Heisenberg ferromagnets and ferrimagnets with different sublattice anisotropies".Journal of Physics-Condensed Matter 9.38(1997):8101-8118. |
入库方式： OAI收割
来源：金属研究所
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