YIG/CoFeB bilayer magnonic diode

arXiv (Cornell University)

Abstract

We demonstrate a magnonic diode based on a bilayer structure of Yttrium Iron Garnet (YIG) and Cobalt Iron Boron (CoFeB). The bilayer exhibits pronounced non-reciprocal spin-wave propagation, enabled by dipolar coupling and the magnetic properties of the two layers. The YIG layer provides low damping and efficient spin-wave propagation, while the CoFeB layer introduces strong magnetic anisotropy, critical for achieving diode functionality. Experimental results, supported by numerical simulations, show unidirectional propagation of Magnetostatic Surface Spin Waves (MSSW), significantly suppressing backscattered waves. This behavior was confirmed through wavevector-resolved and micro-focused Brillouin Light Scattering measurements and is supported by numerical simulations. The proposed YIG/SiO$_2$/CoFeB bilayer magnonic diode demonstrates the feasibility of leveraging non-reciprocal spin-wave dynamics for functional magnonic devices, paving the way for energy-efficient, wave-based signal processing technologies.

Authors 11

1. Noura Zenbaa

   University of Vienna

   Affiliation as printed

   University of Vienna , Faculty of Physics , Vienna 1090 , Austria

   University of Vienna , Vienna Doctoral School in Physics , Vienna 1090 , Austria

2. Khrystyna O. Levchenko

   University of Vienna

   Affiliation as printed

   University of Vienna , Faculty of Physics , Vienna 1090 , Austria

3. Kristýna Davídková
4. Moritz Ruhwedel Aachen Chair of Solar Technology

   Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR) · RWTH Aachen University

   Affiliation as printed

   Chair of Solar Technology RWTH Aachen University Linder Höhe , 51147 Köln , Germany

   Deutsches Zentrum für Luft-und Raumfahrt e. V. (German Aerospace Center , DLR) , Institute of Solar Research Linder Höhe , 51147 Köln , Germany

5. Sebastian Knauer

   University of Vienna

   Affiliation as printed

   University of Vienna , Faculty of Physics , Vienna 1090 , Austria

6. Morris Lindner

   Innovent

   Affiliation as printed

   INNOVENT e.V. Technologieentwicklung , 07745 Jena , Germany

7. Carsten Dubs

   Innovent

   Affiliation as printed

   INNOVENT e.V. Technologieentwicklung , 07745 Jena , Germany

8. Qi Wang

   University of Kaiserslautern

   Affiliation as printed

   Fachbereich Physik and Landesforschungszentrum OPTIMAS , RPTU Kaiserslautern -Landau , 67663 Kaiserslautern , Germany

   School of Physics , Hubei Key Laboratory of Gravitation and Quantum Physics ,

9. Michal Urbánek
10. Philipp Pirro

    Huazhong University of Science and Technology

    Affiliation as printed

    Institute for Quantum Science and Engineering , Huazhong University of Science and Technology , Wuhan , 430074 , China

11. Andrii V. Chumak

    University of Vienna · Central European Institute of Technology · Brno University of Technology

    Affiliation as printed

    CEITEC BUT , Brno University of Technology , 612 00 Brno , Czech Republic

    University of Vienna , Faculty of Physics , Vienna 1090 , Austria