National Laboratory of Solid State Microstructures, Department of Physics and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, 22 Hankou Road, Nanjing 210093, People's Republic of China.
Phys Rev Lett. 2018 Jan 26;120(4):047201. doi: 10.1103/PhysRevLett.120.047201.
We clarify the physical origin of the dc voltage generation in a bilayer of a conducting polymer film and a micrometer-thick magnetic insulator Y_{3}Fe_{5}O_{12} (YIG) film under ferromagnetic resonance and/or spin wave excitation conditions. The previous attributed mechanism, the inverse spin Hall effect in the polymer [Nat. Mater. 12, 622 (2013)NMAACR1476-112210.1038/nmat3634], is excluded by two control experiments. We find an in-plane temperature gradient in YIG which has the same angular dependence with the generated voltage. Both vanish when the YIG thickness is reduced to a few nanometers. Thus, we argue that the dc voltage is governed by the Seebeck effect in the polymer, where the temperature gradient is created by the nonreciprocal magnetostatic surface spin wave propagation in YIG.
我们澄清了在铁磁共振和/或自旋波激发条件下，导电聚合物薄膜和微米厚的磁性绝缘体 Y_3Fe_5O_12（YIG）薄膜双层中直流电压产生的物理起源。先前归因于聚合物中的逆自旋霍尔效应[Nat. Mater. 12, 622 (2013)NMAACR1476-112210.1038/nmat3634]的机制被两个对照实验排除。我们发现 YIG 中存在平面内温度梯度，其与产生的电压具有相同的角度依赖性。当 YIG 厚度减小到几纳米时，两者都消失了。因此，我们认为直流电压由聚合物中的塞贝克效应控制，其中温度梯度由 YIG 中非互易磁静表面自旋波传播产生。
