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Direct Imaging of High‐Frequency Multimode Spin Wave Propagation in Cobalt‐Iron Waveguides Using X‐Ray Microscopy beyond 10 GHz
Author(s) -
Träger Nick,
Gruszecki Paweł,
Lisiecki Filip,
Förster Johannes,
Weigand Markus,
Wintz Sebastian,
Stoll Hermann,
Głowiński Hubert,
Kuświk Piotr,
Krawczyk Maciej,
Gräfe Joachim
Publication year - 2020
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.202000373
Subject(s) - excitation , magnonics , optics , waveguide , multi mode optical fiber , physics , spin wave , wave propagation , materials science , spin hall effect , condensed matter physics , optical fiber , spin polarization , quantum mechanics , electron , ferromagnetism
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.