论文标题
在磁偶极子方面观察evanevencent旋转波
Observation of evanescent spin waves in the magnetic dipole regime
论文作者
论文摘要
我们观察到通过可作为禁止区域的气隙的自旋波传播。旋转波通过反向法拉第的圆极化泵脉冲激发了自旋波，并通过使用泵探针成像技术的探针脉冲的法拉第效应检测到它们的空间传播。使用Green的功能方法和微磁模拟的数值计算来重现实验观察到的自旋波传播。我们发现，自旋波的振幅在气隙中呈指数衰减，这表明磁偶极子体制中存在evaneastent旋转波。这一发现将为通过人造镁晶体传播的自旋波的可控振幅和阶段铺平道路。
We observed spin-wave transmission through an air gap that works as a prohibited region. The spin waves were excited by circularly polarized pump pulses via the inverse Faraday effect, and their spatial propagation was detected through the Faraday effect of probe pulses using a pump-probe imaging technique. The experimentally observed spin-wave transmission was reproduced using numerical calculations with a Green's function method and micromagnetic simulation. We found that the amplitude of the spin waves decays exponentially in the air gap, which indicates the existence of evanescent spin waves in the magnetic dipole regime. This finding will pave the way for controllable amplitudes and phases of spin waves propagating through an artificial magnonic crystal.
