Magnon-drag thermoelectric transport with skyrmion structure
Magnon-drag thermoelectric transport with skyrmion structure
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DOI：
10.1063/5.0017272
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发表时间：
2020-08-10
影响因子：
4
通讯作者：
Ohe, Jun-ichiro
中科院分区：
文献类型：
--
作者：
Hoshi, Koujiro;Yamaguchi, Terufumi;Ohe, Jun-ichiro
研究了在温度梯度下，具有和不具有Skyrmion结构的铁磁体的磁化动力学驱动的热电效应。我们计算的电荷电流在一个四端几何使用绝热泵公式充分考虑磁化动力学的基础上随机Landau-Lifshitz-吉尔伯特方程。热驱动自旋波通过自旋转移和动量转移过程诱导产生纵向电流（Seebeck效应），这两个过程在具有负（正）s-d交换相互作用的铁磁体中起建设性（破坏性）作用。横向电流（反常能斯特效应）的出现与skyrmions的数量成比例，其机制被确定为磁振子的热拓扑霍尔效应，随后是动量转移阻力过程。
Thermoelectric effects driven by magnetization dynamics under a temperature gradient are studied for ferromagnets with and without a skyrmion structure. We calculate charge currents in a four-terminal geometry using the adiabatic pumping formula with full account of magnetization dynamics based on the stochastic Landau-Lifshitz-Gilbert equation. The longitudinal current (Seebeck effect) is induced from the thermally driven spin waves via the spin-transfer and momentum-transfer processes, and these two processes contribute constructively (destructively) in ferromagnets having a negative (positive) s-d exchange interaction. The transverse currents (anomalous Nernst effect) arise in proportion to the number of skyrmions, whose mechanism is identified as the thermal topological Hall effect of magnons followed by the momentum-transfer drag process.