Nonlinear Magnon Polaritons.

Autor: Lee O; London Centre for Nanotechnology, University College London, London WC1H 0AH, United Kingdom., Yamamoto K; Advanced Science Research Center, Japan Atomic Energy Agency, 2-4 Shirakata, Tokai 319-1195, Japan., Umeda M; Advanced Science Research Center, Japan Atomic Energy Agency, 2-4 Shirakata, Tokai 319-1195, Japan.; Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan., Zollitsch CW; London Centre for Nanotechnology, University College London, London WC1H 0AH, United Kingdom., Elyasi M; WPI Advanced Institute for Materials Research, Tohoku University, 2-1-1, Katahira, Sendai 980-8577, Japan., Kikkawa T; Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan., Saitoh E; Advanced Science Research Center, Japan Atomic Energy Agency, 2-4 Shirakata, Tokai 319-1195, Japan.; WPI Advanced Institute for Materials Research, Tohoku University, 2-1-1, Katahira, Sendai 980-8577, Japan.; Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan.; Institute for AI and Beyond, The University of Tokyo, Tokyo 113-8656, Japan., Bauer GEW; WPI Advanced Institute for Materials Research, Tohoku University, 2-1-1, Katahira, Sendai 980-8577, Japan.; Kavli Institute for Theoretical Sciences, University of the Chinese Academy of Sciences, Beijing 100190, China., Kurebayashi H; London Centre for Nanotechnology, University College London, London WC1H 0AH, United Kingdom.; WPI Advanced Institute for Materials Research, Tohoku University, 2-1-1, Katahira, Sendai 980-8577, Japan.; Department of Electronic and Electrical Engineering, University College London, London WC1E 7JE, United Kingdom.
Jazyk: angličtina
Zdroj: Physical review letters [Phys Rev Lett] 2023 Jan 27; Vol. 130 (4), pp. 046703.
DOI: 10.1103/PhysRevLett.130.046703
Abstrakt: We experimentally and theoretically demonstrate that nonlinear spin-wave interactions suppress the hybrid magnon-photon quasiparticle or "magnon polariton" in microwave spectra of a yttrium iron garnet film detected by an on-chip split-ring resonator. We observe a strong coupling between the Kittel and microwave cavity modes in terms of an avoided crossing as a function of magnetic fields at low microwave input powers, but a complete closing of the gap at high powers. The experimental results are well explained by a theoretical model including the three-magnon decay of the Kittel magnon into spin waves. The gap closure originates from the saturation of the ferromagnetic resonance above the Suhl instability threshold by a coherent backreaction from the spin waves.
Databáze: MEDLINE