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Investigation of Mode-Induced Spin Wave Transmission Blockage by In Situ Nanoscale Grooves
Small ( IF 13.0 ) Pub Date : 2024-09-09 , DOI: 10.1002/smll.202404542 Cyril Delforge 1 , Nicolas Lejeune 1 , Suraj Singh 1 , Alejandro V Silhanek 1 , Emile Fourneau 1
Small ( IF 13.0 ) Pub Date : 2024-09-09 , DOI: 10.1002/smll.202404542 Cyril Delforge 1 , Nicolas Lejeune 1 , Suraj Singh 1 , Alejandro V Silhanek 1 , Emile Fourneau 1
Affiliation
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In the pursuit of advancing spin-wave optics, the propagation of magnetostatic surface spin-waves is investigated in a uniform permalloy waveguide with in-situ nanopatterned grooves created through Atomic Force Microscopy nanolithography and Focused Ion Beam etching. The study unveils that the introduction of narrow constrictions and grooves leads to a non-monotonic reduction of the transmitted spin-wave signal intensity as the spin-wave pathway is shrinked. The remarkable feature that a stronger signal extinction is obtained for a narrow groove compared to a spin-waveguide interrupted by a full gap, where only inefficient transport through dipolar coupling is allowed, is highlighted. Combining experimental and numerical analyses, the intricate interplay between spin-wave diffraction and reflection at the waveguide edges is unraveled, being at the origin of a transverse-mode variation responsible for the signal extinction when detected using coplanar antennas. The findings offer insights into the controllable manipulation of detected spin-wave intensity, thereby opening promising avenues for the improvement of spin-wave switches and interferometers, and for the nanopatterning of graded index magnonics.
中文翻译：
原位纳米级凹槽对模式诱导的自旋波传输阻塞的研究
在追求先进的自旋波光学的过程中，静磁表面自旋波在均匀的坡莫合金波导中进行了研究，该波导通过原子力显微镜纳米光刻和聚焦离子束蚀刻创建了原位纳米图案槽。该研究揭示了随着自旋波通路的缩小，狭窄收缩和凹槽的引入导致传输的自旋波信号强度的非单调降低。强调了一个显着的特点，即与被全间隙中断的自旋波导相比，窄槽获得了更强的信号消光，其中只允许通过偶极耦合进行低效传输。结合实验和数值分析，揭示了自旋波衍射和波导边缘反射之间错综复杂的相互作用，这是使用共面天线探测到时导致信号消光的横模变化的根源。这些发现为检测到的自旋波强度的可控操纵提供了见解，从而为改进自旋波开关和干涉仪以及渐变折射率磁振子的纳米图案化开辟了有希望的途径。
更新日期：2024-09-09
中文翻译：
原位纳米级凹槽对模式诱导的自旋波传输阻塞的研究
在追求先进的自旋波光学的过程中，静磁表面自旋波在均匀的坡莫合金波导中进行了研究，该波导通过原子力显微镜纳米光刻和聚焦离子束蚀刻创建了原位纳米图案槽。该研究揭示了随着自旋波通路的缩小，狭窄收缩和凹槽的引入导致传输的自旋波信号强度的非单调降低。强调了一个显着的特点，即与被全间隙中断的自旋波导相比，窄槽获得了更强的信号消光，其中只允许通过偶极耦合进行低效传输。结合实验和数值分析，揭示了自旋波衍射和波导边缘反射之间错综复杂的相互作用，这是使用共面天线探测到时导致信号消光的横模变化的根源。这些发现为检测到的自旋波强度的可控操纵提供了见解，从而为改进自旋波开关和干涉仪以及渐变折射率磁振子的纳米图案化开辟了有希望的途径。
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