Recent years have witnessed a rapidly growing interest in exploring the use of spin waves for information transmission and computation toward establishing a spin-wave-based technology that is not only significantly more energy efficient than the CMOS technology, but may also cause a major departure from the von-Neumann architecture by enabling memory-in-logic and logic-in-memory architectures. A major bottleneck of advancing this technology is the excitation of spin waves with short wavelengths, which is a must because the wavelength dictates device scalability. Here, we report the discovery of an approach for the excitation of nm-wavelength spin waves. The demonstration uses ferromagnetic nanowires grown on a 20-nm-thick Y3Fe5O12 film strip. The propagation of spin waves with a wavelength down to 50 nm over a distance of 60,000 nm is measured. The measurements yield a spin-wave group velocity as high as 2600 m s−1, which is faster than both domain wall and skyrmion motions.
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机译：近年来，目睹了人们对探索使用自旋波进行信息传输和计算以建立基于自旋波的技术的兴趣迅速增长，该技术不仅比CMOS技术具有更高的能源效率，而且还可能导致与通过启用逻辑内存和内存逻辑架构来实现von-Neumann架构。推进该技术的主要瓶颈是激发短波长的自旋波，这是必须的，因为波长决定了设备的可扩展性。在这里，我们报告了一种激发nm波长自旋波的方法的发现。演示使用在20 nm厚的Y3Fe5O12薄膜条上生长的铁磁纳米线。测量了自旋波在60,000 nm距离内的低至50 nm的传播。这些测量产生的自旋波群速度高达2600 m s -1 ，这快于畴壁运动和天体运动。
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