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Phys Rev Lett. 2018 May 25;120(21):217202. doi: 10.1103/PhysRevLett.120.217202.

Strong Interlayer Magnon-Magnon Coupling in Magnetic Metal-Insulator Hybrid Nanostructures.

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Fert Beijing Institute, BDBC, School of Electronic and Information Engineering, Beihang University, Xueyuan Road 37, Beijing 100191, China.
Department of Physics, Colorado State University, Fort Collins, Colorado 80523, USA.
Department of Applied Physics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
Department of Physics, Beijing Normal University, Beijing 100875, China.
Institute for Materials Research, WPI-AIMR and CSNR, Tohoku University, Sendai 980-8577, Japan.
Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.


We observe strong interlayer magnon-magnon coupling in an on-chip nanomagnonic device at room temperature. Ferromagnetic nanowire arrays are integrated on a 20-nm-thick yttrium iron garnet (YIG) thin film strip. Large anticrossing gaps up to 1.58 GHz are observed between the ferromagnetic resonance of the nanowires and the in-plane standing spin waves of the YIG film. Control experiments and simulations reveal that both the interlayer exchange coupling and the dynamical dipolar coupling contribute to the observed anticrossings. The coupling strength is tunable by the magnetic configuration, allowing the coherent control of magnonic devices.

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