Propagation of thermally induced magnonic spin currents
Propagation of thermally induced magnonic spin currents
复制标题
DOI：
10.1103/physrevb.89.024409
复制
发表时间：
2014-01
影响因子：
3.7
通讯作者：
U. Ritzmann;D. Hinzke;U. Nowak
中科院分区：
文献类型：
--
作者：
U. Ritzmann;D. Hinzke;U. Nowak
本文在一个以随机Landau-Lifshitz-吉尔伯特方程为基础的原子自旋模型的框架内研究了磁振子在温度梯度中的传播。我们分析了磁振子的积累、磁振子温度分布以及激发磁振子的传播长度。所产生的磁振子的频率分布进行了调查，以推导出的各向异性和阻尼参数上的磁振子传播长度的影响的表达式。对于软铁磁绝缘体与低阻尼的传播长度在一些$\mu$m的范围内，可以预期交换驱动的磁振子。
The propagation of magnons in temperature gradients is investigated within the framework of an atomistic spin model with the stochastic Landau-Lifshitz-Gilbert equation as underlying equation of motion. We analyze the magnon accumulation, the magnon temperature profile as well as the propagation length of the excited magnons. The frequency distribution of the generated magnons is investigated in order to derive an expression for the influence of the anisotropy and the damping parameter on the magnon propagation length. For soft ferromagnetic insulators with low damping a propagation length in the range of some $\mu$m can be expected for exchange driven magnons.