Optically Inspired Nanomagnonics with Nonreciprocal Spin Waves in Synthetic Antiferromagnets
Optically Inspired Nanomagnonics with Nonreciprocal Spin Waves in Synthetic Antiferromagnets
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DOI：
10.1002/adma.201906439
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发表时间：
2020-01-16
影响因子：
29.4
通讯作者：
Petti, Daniela
中科院分区：
文献类型：
--
作者：
Albisetti, Edoardo;Tacchi, Silvia;Petti, Daniela
预计集成光学启发的基于波的处理将在图像处理和语音识别等特定任务中超越数字架构。从这个角度来看，自旋波因其在千兆赫频率范围内的纳米级波长和丰富的现象学而代表了一条有前途的途径。在这里，实现了一个使用自旋波的多功能光学平台，展示了自旋波与纳米级波长的波前工程、聚焦和鲁棒干涉。特别是，基于定制自旋纹理的磁波纳米天线用于发射空间成形的相干波前、衍射限制的自旋波光束，并生成鲁棒的多光束干涉图案，其空间延伸数倍于自旋波波长。此外，研究表明，合成反铁磁体中的自旋波非互易性自然会产生诸如背反射弹性等有趣的特征，从而保持了来自寄生反向传播模式的干涉图案的高质量。这项工作代表了实现基于自旋波的纳米级光学激发器件的基本一步。
Integrated optically inspired wave-based processing is envisioned to outperform digital architectures in specific tasks, such as image processing and speech recognition. In this view, spin waves represent a promising route due to their nanoscale wavelength in the gigahertz frequency range and rich phenomenology. Here, a versatile, optically inspired platform using spin waves is realized, demonstrating the wavefront engineering, focusing, and robust interference of spin waves with nanoscale wavelength. In particular, magnonic nanoantennas based on tailored spin textures are used for launching spatially shaped coherent wavefronts, diffraction-limited spin-wave beams, and generating robust multi-beam interference patterns, which spatially extend for several times the spin-wave wavelength. Furthermore, it is shown that intriguing features, such as resilience to back reflection, naturally arise from the spin-wave nonreciprocity in synthetic antiferromagnets, preserving the high quality of the interference patterns from spurious counterpropagating modes. This work represents a fundamental step toward the realization of nanoscale optically inspired devices based on spin waves.