论文标题
通过声学分布的bragg反射器腔增强声旋转泵送
Enhancement of acoustic spin pumping by acoustic distributed Bragg reflector cavity
论文作者
论文摘要
GHz频率范围内的表面声波（锯）可以通过与铁磁共振相关的自旋泵浦效应，动态地注入旋转电流到相邻的非磁性层中。在这里，我们通过一对锯反射器光栅展示了声学铁磁共振和自旋电流产生的增强，这形成了分布式bragg反射器腔的声学类似物。在实验中，我们确认了2.04 $ \ pm $ 0.02倍的腔内锯功率吸收功率比没有声腔的情况下。我们通过测量Cu和Bi $ _2 $ o $ $ _3 $之间的接口，通过测量由逆Edelstein效应（IEE）产生的电压（IEE）生成的电压来确认高达2.96美元$ \ pm $ 0.02倍的旋转当前一代。结果表明，声腔对于提高锯驱动耦合的镁音波动力学的转化效率将是有用的。
Surface acoustic waves (SAWs) in the GHz frequency range can inject spin currents dynamically into adjacent nonmagnetic layers via spin pumping effect associated with ferromagnetic resonance. Here, we demonstrate an enhancement of acoustic ferromagnetic resonance and spin current generation by a pair of SAW reflector gratings, which form an acoustic analogue of the distributed Bragg reflector cavity. In the experiment, we confirmed 2.04 $\pm$ 0.02 times larger SAW power absorption in a device with cavity than in case of no acoustic cavity. We confirmed up to 2.96 $\pm$ 0.02 times larger spin current generation by measuring electric voltages generated by the inverse Edelstein effect (IEE) at the interface between Cu and Bi$_2$O$_3$. The results suggest that acoustic cavities would be useful to enhance the conversion efficiency in SAW driven coupled magnon-phonon dynamics.
