Spin wave dynamics in Heisenberg ferromagnetic/antiferromagnetic single-walled nanotubes
| Autor: | Bin-Zhou Mi |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Physics
Spin polarization Condensed matter physics Magnon Energy level splitting Plane wave 02 engineering and technology Zero field splitting 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Spin wave Dispersion relation 0103 physical sciences Condensed Matter::Strongly Correlated Electrons Wave vector Electrical and Electronic Engineering 010306 general physics 0210 nano-technology |
| Zdroj: | Physica B: Condensed Matter. 497:23-30 |
| ISSN: | 0921-4526 |
| DOI: | 10.1016/j.physb.2016.05.029 |
| Popis: | The spin wave dynamics, including the magnetization, spin wave dispersion relation, and energy level splitting, of Heisenberg ferromagnetic/antiferromagnetic single-walled nanotubes are systematically calculated by use of the double-time Green’s function method within the random phase approximation. The role of temperature, diameter of the tube, and wave vector on spin wave energy spectrum and energy level splitting are carefully analyzed. There are two categories of spin wave modes, which are quantized and degenerate, and the total number of independent magnon branches is dependent on diameter of the tube, caused by the physical symmetry of nanotubes. Moreover, the number of flat spin wave modes increases with diameter of the tube rising. The spin wave energy and the energy level splitting decrease with temperature rising, and become zero as temperature reaches the critical point. At any temperature, the energy level splitting varies with wave vector, and for a larger wave vector it is smaller. When pb =π, the boundary of first Brillouin zone, spin wave energies are degenerate, and the energy level splittings are zero. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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