Backward volume vs Damon-Eshbach: A traveling spin wave spectroscopy comparison
Backward volume vs Damon-Eshbach: A traveling spin wave spectroscopy comparison
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DOI：
10.1063/1.5125751
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发表时间：
2020-01-21
影响因子：
3.2
通讯作者：
Devolder, T.
中科院分区：
文献类型：
--
作者：
Bhaskar, U. K.;Talmelli, G.;Devolder, T.
我们比较了在相同的，30 nm厚，铁磁，CoFeB波导的电转换达蒙-Eshbach自旋波（DESW）和反向体积自旋波（BVSW）配置的特性。亚微米U形天线用于提供必要的面内和面外RF场。我们测量自旋波传输相对于平面内的场方向，频率和传播距离。与DESW不同的是，BVSW在传播的任一方向上都是反向转换和收集的，但其传输能量的能力低于DESW，原因有两个。这首先是因为BVSW的感应转换效率低于DESW。此外，在通常由我们的天线激发的波矢量范围内（类似于5 rad mu m（-1）），BVSW的群速度保持低于DESW的群速度，这导致传播能力降低，从而以指数方式影响传输信号。相反，DESWs的群速度在低场时最大，并随着外加场的增大而不断减小。测量的SW特性的基本特征是由一个简单的，一维的分析模型，它可以用来评估每个配置的潜力，以及往复。由AIP Publishing授权出版。
We compare the characteristics of electrically transduced Damon-Eshbach spin-wave (DESW) and backward volume spin-wave (BVSW) configurations within the same, 30 nm thick, ferromagnetic, CoFeB waveguide. Sub-micrometer 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 BVSWs are inductively transduced less efficiently than DESWs. Also, in the range of wavevectors (similar to 5 rad mu m(-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, 1D analytical model, which can be used to assess the potential of each configuration. Published under license by AIP Publishing.