论文标题
向后体积与Damon-Eshbach：旅行自旋波光谱比较
Backward volume vs Damon-Eshbach: a travelling spin wave spectroscopy comparison
论文作者
论文摘要
我们比较了在同一，30 nm厚的，铁磁性的COFEB波导中，比较了电传递的Damon-Eshbach（Desws）和向后体积（BVSWS）配置的特性。亚微米U形天线用于提供必要的平面内和平面外RF场。我们在平面场方向，频率和传播距离方面测量自旋波传播。与Desw不同，BVSW是在传播方向的相互转导和收集的，但是由于两个原因，它们的运输能力低于Desws。首先，这是因为BVSW的感应转导的效率低于DESWS。同样，在我们的天线通常激发的波频范围（〜5rad。UM-1）中，BVSW的组速度保持在DESW的速度低，这会导致以指数级别影响传播信号的传播能力降低。相比之下，在低场上，DESWS的组速度最大，并且与所施加的场不断减小。测得的SW特性的基本特征是通过简单的1D分析模型很好地回报的，该模型可用于评估每种配置的潜力。
We compare the characteristics of electrically transduced Damon-Eshbach (DESWs) and backward volume (BVSWs) configurations within the same, 30 nm thick, ferromagnetic, CoFeB waveguide. Sub-micron U-shaped antennas are used to deliver the necessary in-plane and out-of-plane RF fields. We measure the spin-wave transmission with respect to in-plane field orientation, frequency and propagation distance. Unlike DESW, BVSWs are reciprocally transduced and collected for either direction of propagation, but their ability to transport energy is lower than DESWs for two reasons. This arises first because BVSW are inductively transduced less efficiently than DESWs. Also, in the range of wavevectors (~5 rad. um-1) typically excited by our antennas, the group velocity of BVSWs stays lower than that of DESW, which leads to reduced propagation ability that impact transmission signals in an exponential manner. In contrast, the group velocity of DESWs is maximum at low fields and decreases continuously with the applied field. The essential features of the measured SW characteristics are well reciprocated by a simple, 1-D analytical model which can be used to assess the potential of each configuration.
