Direct Imaging of High‐Frequency Multimode Spin Wave Propagation in Cobalt‐Iron Waveguides Using X‐Ray Microscopy beyond 10 GHz,Physica Status Solidi-Rapid Research Letters

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Direct Imaging of High‐Frequency Multimode Spin Wave Propagation in Cobalt‐Iron Waveguides Using X‐Ray Microscopy beyond 10 GHz
Physica Status Solidi-Rapid Research Letters ( IF 2.5 ) Pub Date : 2020-09-04 , DOI: 10.1002/pssr.202000373
Nick Träger ₁ , Paweł Gruszecki _{2,

3} , Filip Lisiecki ₃ , Johannes Förster ₁ , Markus Weigand ₄ , Sebastian Wintz _{1,

5} , Hermann Stoll _{1,

6} , Hubert Głowiński ₃ , Piotr Kuświk ₃ , Maciej Krawczyk ₂ , Joachim Gräfe ₁

Affiliation

Not only in fundamental wave physics but also in technical areas such as radar and communication systems, high‐frequency magnonics is increasingly attracting attention. Here, time‐resolved scanning transmission X‐ray microscopy is used to directly image high‐frequency spin wave propagation in cobalt‐iron waveguides at excitation frequencies above 10 GHz. In addition, an excitation technique is presented, which allows for versatile pump–probe experiments with radio frequency currents up to 30 GHz. With this approach, a global sinusoidal magnetic field excitation is applied to induce spin waves from the waveguide edges. Amplitude, relative phase, and k‐space information as a function of excitation frequencies and static external fields are observed, matching the theoretical predictions for confined waveguide structures. In doing so, the foundation for high‐frequency multimode spin wave excitation and propagation at the nanoscale is laid, which can be a prospective path in radar and communication systems.

中文翻译：

使用超过10 GHz的X射线显微镜对钴铁波导中的高频多模自旋波传播进行直接成像

不仅在基波物理领域，而且在雷达和通信系统等技术领域，高频电磁技术也越来越受到关注。在这里，时间分辨扫描透射X射线显微镜用于在10 GHz以上的激发频率下直接成像高频自旋波在钴铁波导中的传播。此外，还介绍了一种激励技术，该技术可用于高达30 GHz的射频电流的多功能泵浦探针实验。通过这种方法，可以施加整体正弦磁场激励，以从波导边缘感应出自旋波。幅度，相对相位和k观察到的空间信息是激发频率和静态外部场的函数，与有限波导结构的理论预测相符。这样做为高频多模自旋波在纳米级的激发和传播奠定了基础，这可以成为雷达和通信系统中的预期之路。

更新日期：2020-09-04

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