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

Ping Che, Korbinian Baumgaertl, Anna Kúkol’ová, Carsten Dubs and Dirk Grundler ()
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Ping Che: Institute of Materials (IMX), École Polytechnique Fédérale de Lausanne (EPFL)
Korbinian Baumgaertl: Institute of Materials (IMX), École Polytechnique Fédérale de Lausanne (EPFL)
Anna Kúkol’ová: Institute of Materials (IMX), École Polytechnique Fédérale de Lausanne (EPFL)
Carsten Dubs: INNOVENT e.V., Technologieentwicklung
Dirk Grundler: Institute of Materials (IMX), École Polytechnique Fédérale de Lausanne (EPFL)

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: 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.

Date: 2020
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DOI: 10.1038/s41467-020-15265-1

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