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Efficient wavelength conversion of exchange magnons below 100 nm by magnetic coplanar waveguides

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author ChePing, BaumgaertlKorbinian, KukolovaAnna, DubsCarsten, GrundlerDirk,
Project Discovery and Nanoengineering of Novel Skyrmion-hosting Materials
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Original article (peer-reviewed)

Journal Nat.Comm.
Publisher Springer Nature, UK
Volume (Issue) 11
Page(s) 1445
Title of proceedings Nat.Comm.
DOI 10.1038/s41467-020-15265-1

Open Access

URL https://www.nature.com/articles/s41467-020-15265-1
Type of Open Access Publisher (Gold Open Access)

Abstract

Exchange magnons are essential for unprecedented miniaturization of GHz electronics and magnon-based logic. However, their efficient excitation via microwave fields is still a challenge. Current methods including nanocontacts and grating couplers require advanced nanofabrication tools which limit the broad usage. Here, we report efficient emission and detection of exchange magnons using micron-sized coplanar waveguides (CPWs) into which we integrated ferromagnetic (m) layers. We excited magnons in a broad frequency band with wavelengths λ down to 100 nm propagating over macroscopic distances in thin yttrium iron garnet. Applying time- and spatially resolved Brillouin light scattering as well as micromagnetic simulations we evidence a significant wavelength conversion process near mCPWs via tunable inhomogeneous fields. We show how optimized mCPWs can form microwave-to-magnon transducers providing phase-coherent exchange magnons with λ of 37 nm. Without any nanofabrication they allow one to harvest the advantages of nanomagnonics by antenna designs exploited in conventional microwave circuits.
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