Emission and propagation of 1D and 2D spin waves with nanoscale wavelengths in anisotropic spin textures
Emission and propagation of 1D and 2D spin waves with nanoscale wavelengths in anisotropic spin textures
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DOI：
10.1038/s41565-019-0383-4
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发表时间：
2018-07
影响因子：
38.3
通讯作者：
V. Sluka;T. Schneider;R. Gallardo;A. Kákay;M. Weigand;T. Warnatz;R. Mattheis;A. Roldán-Molina;P. Landeros;V. Tiberkevich;A. Slavin;G. Schütz;A. Erbe;A. Deac;J. Lindner;J. Raabe;J. Fassbender;S. Wintz
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文献类型：
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作者：
V. Sluka;T. Schneider;R. Gallardo;A. Kákay;M. Weigand;T. Warnatz;R. Mattheis;A. Roldán-Molina;P. Landeros;V. Tiberkevich;A. Slavin;G. Schütz;A. Erbe;A. Deac;J. Lindner;J. Raabe;J. Fassbender;S. Wintz
自旋波为计算和信号处理提供了有趣的新视角，因为它们的阻尼可以低于传统 CMOS 电路中的欧姆损耗。为了控制实际芯片上自旋波的空间范围和传播，磁畴壁作为磁波导显示出相当大的潜力。然而，纳米级波长的自旋波的低损耗引导，特别是在有角度的轨道周围，仍有待展示。在这里，我们通过实验证明，可以利用层间交换耦合、各向异性铁磁双层中磁序的自然特征来获得对传播自旋波的这种先进控制。使用扫描透射 X 射线显微镜，我们对自旋波的生成及其在超过波长数倍的距离上的传播、在扩展的平面几何形状以及沿着一维畴壁（可以是直的和弯曲的）进行成像。观察到的波长范围在 1 μm 到 150 nm 之间，相应的激发频率为 250 MHz 到 3 GHz。我们的结果展示了在未来自旋波逻辑和计算电路中采用畴壁的磁波导的实际实现路线。
Spin waves offer intriguing novel perspectives for computing and signal processing, since their damping can be lower than the Ohmic losses in conventional CMOS circuits. For controlling the spatial extent and propagation of spin waves on the actual chip, magnetic domain walls show considerable potential as magnonic waveguides. However, low-loss guidance of spin waves with nanoscale wavelengths, in particular around angled tracks, remains to be shown. Here we experimentally demonstrate that such advanced control of propagating spin waves can be obtained using natural features of magnetic order in an interlayer exchange-coupled, anisotropic ferromagnetic bilayer. Using Scanning Transmission X-Ray Microscopy, we image generation of spin waves and their propagation across distances exceeding multiple times the wavelength, in extended planar geometries as well as along one-dimensional domain walls, which can be straight and curved. The observed range of wavelengths is between 1 {\mu}m and 150 nm, at corresponding excitation frequencies from 250 MHz to 3 GHz. Our results show routes towards practical implementation of magnonic waveguides employing domain walls in future spin wave logic and computational circuits.