Abstract
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.
Highlights
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
Radar sensors typically require a larger signal bandwidth than communication signals. High performance in both radar and communication applications requires fine-tuning of signals and advanced bandis laid, which can be a prospective path in radar and communication systems
We demonstrate the spatially and temporally radar systems get increasingly important, e.g., for autonomous resolved observation of spin wave excitation and propagation driving
Summary
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. The foundation for high-frequency multimode spin wave excitation and propagation at the nanoscale
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