| Bifurcation of a periodic instanton and quantum－classical transition in the biaxial nano－ferromagnet with a magnetic field along hard axis |
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| 引用本文： | 聂一行,李志坚,梁九卿,严启伟.Bifurcation of a periodic instanton and quantum－classical transition in the biaxial nano－ferromagnet with a magnetic field along hard axis[J].中国物理 B,2003,12(8):905-910. |
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| 作者姓名： | 聂一行 李志坚 梁九卿 严启伟 |
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| 作者单位： | Institute of Theoretical Physics and Department of Physics, Shanxi University, Taiyuan 030006, China; Department of Physics, Yanbei Normal Institute, Datong 037000, China;Institute of Theoretical Physics and Department of Physics, Shanxi University, Taiyuan 030006, China;Institute of Theoretical Physics and Department of Physics, Shanxi University, Taiyuan 030006, China; Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China;Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China |
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| 基金项目： | Project supported by the National Nature Science Foundation of China (Grant Nos 10075032 and 10175039), the Shanxi Nature Science Foundation (Grant No 2001007), and by the Fund of Chinese Academy of Sciences entitled "Nanomic Science and Technology". |
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| 摘 要： | Crossover from classical to quantum regimes of the barrier transition rate in a biaxial ferromagnetic magnet with a magnetic field applied along hard anisotropy axis is investigated. We show that the type of action-temperature diagrams can he determined by counting the number of bifurcation points. The model possesses not only the known type I and Ⅱ, hut also the interesting type Ⅲ and Ⅳ of transition which do not occur in general.
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| 关 键 词： | 量子通道 相变 周期瞬子 磁性 非铁磁性 分支 |
| 收稿时间： | 2002-11-27 |
Bifurcation of a periodic instanton and quantum-classical transition in the biaxial nano-ferromagnet with a magnetic field along hard axis |
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| Nie Yi-Hang,Li Zhi-Jian,Liang Jiu-Qing and Yan Qi-Wei.Bifurcation of a periodic instanton and quantum-classical transition in the biaxial nano-ferromagnet with a magnetic field along hard axis[J].Chinese Physics B,2003,12(8):905-910. |
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| Authors: | Nie Yi-Hang Li Zhi-Jian Liang Jiu-Qing and Yan Qi-Wei |
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| Institution: | Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China; Institute of Theoretical Physics and Department of Physics, Shanxi University, Taiyuan 030006, China; Institute of Theoretical Physics and Department of Physics, Shanxi University, Taiyuan 030006, China; Department of Physics, Yanbei Normal Institute, Datong 037000, China; Institute of Theoretical Physics and Department of Physics, Shanxi University, Taiyuan 030006, China; Institute of Physics, Chinese Academy |
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| Abstract: | Crossover from classical to quantum regimes of the barrier transition rate in a biaxial ferromagnetic magnet with a magnetic field applied along hard anisotropy axis is investigated. We show that the type of action-temperature diagrams can be determined by counting the number of bifurcation points. The model possesses not only the known type I and II, but also the interesting type III and IV of transition which do not occur in general. |
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| Keywords: | quantum tunnelling phase transition |
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