Direct observation of magnon-phonon coupling in yttrium iron garnet

Abstract

The magnetic insulator yttrium iron garnet (YIG) with a ferrimagnetic transition temperature of $\sim$560 K has been widely used in microwave and spintronic devices. Anomalous features in the spin Seeback effect (SSE) voltages have been observed in Pt/YIG and attributed to the magnon-phonon coupling. Here we use inelastic neutron scattering to map out low-energy spin waves and acoustic phonons of YIG at 100 K as a function of increasing magnetic field. By comparing the zero and 9.1 T data, we find that instead of splitting and opening up gaps at the spin wave and acoustic phonon dispersion intersecting points, magnon-phonon coupling in YIG enhances the hybridized scattering intensity. These results are different from expectations of conventional spin-lattice coupling, calling for new paradigms to understand the scattering process of magnon-phonon interactions and the resulting magnon-polarons.

5 pages, 4 figures, PRB in press

References in corpus (10)

• Spin Seebeck insulator
• Spontaneous Magnon Decays
• Magnon Polarons in the Spin Seebeck Effect
• Thermal spin dynamics of yttrium iron garnet
• Coherent elastic excitation of spin waves
• First-Principles Study of Exchange Interactions of Yttrium Iron Garnet
• Spontaneous decays of magneto-elastic excitations in noncollinear antiferromagnet (Y,Lu)MnO3
• Spin Seebeck devices using local on-chip heating
• Spin waves throughout the Brillouin zone and magnetic exchange coupling in ferromagnetic metallic manganites La${}_{1-x}$Ca${}_x$MnO${}_3$ ($x=0.25,0.30$)
• Heat-driven spin transport in a ferromagnetic metal

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• High pressure tuning of magnon-polarons in the layered antiferromagnet FePS${}_3$
• Evidence for magnon-phonon coupling in the topological magnet Cu${}_3$TeO${}_6$
• Magnon-polarons in cubic collinear Antiferromagnets
• Magnon polarons in the spin Peltier effect
• Role of Magnon-Magnon Scattering in Magnon Polaron Spin Seebeck Effect
• Magnon-polaron excitations in the noncollinear antiferromagnet Mn${}_3$Ge
• Spin-Phonon Interaction in Yttrium Iron Garnet
• Neutron Scattering Signature of Phonon Renormalization in Nickel (II) Oxide
• Neutron Scattering Study on Yttrium Iron Garnet for Spintronics
• Understanding spin currents from magnon dispersion and polarization: Spin-Seebeck effect and neutron scattering study on Tb3Fe5O12
• Magnon-polaron formation in XXZ quantum Heisenberg chains
• Terahertz Control of Linear and Nonlinear Magno-Phononics
• Magnetization Dynamics in Quasiperiodic Magnonic Crystals
• Uncovering Obscured Phonon Dynamics from Powder Inelastic Neutron Scattering using Machine Learning