| Автор | Rong Lü |
| Автор | Jia-Lin Zhu |
| Автор | Zhi-Rong Liu |
| Автор | Lee Chang |
| Автор | Bing-Lin Gu |
| Дата выпуска | 2000-05-22 |
| dc.description | The quantum tunnellings of the magnetization vector in single-domain ferromagnetic nanoparticles placed in an external magnetic field at an arbitrarily directed angle in the ZX-plane are studied theoretically. We consider magnetocrystalline anisotropies with trigonal and hexagonal crystal symmetry. By applying the instanton technique in the spin-coherent-state path-integral representation, we calculate the tunnel splittings, the tunnelling rates, and the crossover temperatures in the low-barrier limit for different angle ranges of the external magnetic field (θ<sub>H</sub> = π/2, π/2<<θ<sub>H</sub><<π, and θ<sub>H</sub> = π). Our results show that the tunnel splittings, the tunnelling rates, and the crossover temperatures depend distinctly on the orientation of the external magnetic field, which provides a possible experimental test for magnetic quantum tunnelling in nanometre-scale single-domain ferromagnets. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Spin tunnelling of trigonal and hexagonal ferromagnets in an arbitrarily directed magnetic field |
| Тип | paper |
| DOI | 10.1088/0953-8984/12/20/306 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 12 |
| Первая страница | 4503 |
| Последняя страница | 4522 |
| Аффилиация | Rong Lü; Centre for Advanced Study, Tsinghua University, Beijing 100084, People's Republic of China |
| Аффилиация | Jia-Lin Zhu; Centre for Advanced Study, Tsinghua University, Beijing 100084, People's Republic of China |
| Аффилиация | Zhi-Rong Liu; Centre for Advanced Study, Tsinghua University, Beijing 100084, People's Republic of China |
| Аффилиация | Lee Chang; Centre for Advanced Study, Tsinghua University, Beijing 100084, People's Republic of China |
| Аффилиация | Bing-Lin Gu; Centre for Advanced Study, Tsinghua University, Beijing 100084, People's Republic of China |
| Выпуск | 20 |
