Bifurcation of a periodic instanton and quantum-classical transition in the biaxial nano-ferromagnet with a magnetic field along hard axis

• 来源期刊: 中国物理（英文版）
• 关键词: quantum tunnelling phase transition
• 年，卷（期）: 2003,（8）
• 页码范围: 905-910
• 页数: 6页
• 语种: 英文

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 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.