论文标题
铁磁性绝缘体中木旋旋的物理性质
Physical Nature of Magnon Spin Seebeck Effect in Ferrimagnetic Insulators
论文作者
论文摘要
铁磁性绝缘子（FMI）中的自旋Seebeck效应（SSE）提供了一种简单的方法，可以使用热量操纵镁质，该方法可用作信息和能量转换的载体。但是，仍然缺乏可以定量解释实验结果的理论。在本文中，我们通过将宏观玻尔兹曼方程与微观量子散射理论相结合，在低温下在低温下开发了一种FMI中的镁传输理论。发现镁的散射由声子而不是木元素支配，并且镁的松弛时间与温度立方呈成反比。在极低的温度区域，磁杆进入弹道传输过程。此外，我们还得出具有样品位置的横向SSE信号的线性空间分布。所有理论结果与实验数据都非常吻合。
The spin Seebeck effect (SSE) in ferrimagnetic insulators (FMI) provides a simple method of using heat to manipulate magnons, which could be used as carriers of information and energy conversion. However, a theory that can quantitively interpret experimental results is still lacking. In this paper, we develop a transport theory of magnons in FMI at low temperatures by combining the macroscopic Boltzmann equation with microscopic quantum scattering theory. It is found that the scattering of magnons is dominated by phonons rather than magnons, and the relaxation time of magnon is inversely proportional to the cube of temperature. At extremely low temperature region, the magnon enters the ballistic transport process. In addition, we also derive the linear spatial distribution of the transverse SSE signal with sample position. All the theoretical results are in excellent agreement with the experimental data.
