超顺磁自旋是经典的吗？
Are superparamagnetic spins classical?
摘要：
磁性纳米粒子的有效巨自旋在传统的超顺磁性理论中是经典的，基于Landau-Lifshitz-Langevin方程。然而，一个大的自旋与单轴各向异性的微观计算，耦合到晶格通过最简单的通用机制，表明传统的理论的结果是不能复制的限制S -> \infty。特别地，势垒上的Arrhenius逃逸率中的前因子γ_0对横场等破缺相互作用有极大的敏感性
英文摘要：
Effective giant spins of magnetic nanoparticles are considered classically in the conventional theory of superparamagnetism based on the Landau-Lifshitz-Langevin equation. However, microscopic calculations for a large spin with uniaxial anisotropy, coupled to the lattice via the simplest generic mechanism, show that the results of the conventional theory are not reproduced in the limit S ->\infty. In particular, the prefactor Gamma_0 in the Arrhenius escape rate over the barrier Gamma =Gamma_0 exp[-Delta U/(k_B T)] has an anomalously large sensitivity to symmetry-breaking interactions such as transverse field
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
