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Direct Imaging of High‐Frequency Multimode Spin Wave Propagation in Cobalt‐Iron Waveguides Using X‐Ray Microscopy beyond 10 GHz

Research Area: Magnonics Year: 2020
Type of Publication: Article
  • Nick Träger
  • Paweł Gruszecki
  • Filip Lisiecki
  • Johannes Förster
  • Markus Weigand
  • Sebastian Wintz
  • Hermann Stoll
  • Hubert Głowiński
  • Piotr Kuświk
  • Maciej Krawczyk
  • Joachim Gräfe
Journal: phys. status solidi (RRL)
Pages: 2000373
Month: October
ISSN: 1862-6254
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.
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