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.

arXiv comment5 pages, 4 figures, PRB in press

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Cited by in corpus (28)

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• Magnon-polarons in van der Waals antiferromagnet FePS3
• Spin and spin current -- From fundamentals to recent progress
• Observation of magnon-polarons in a uniaxial antiferromagnetic insulator
• First-principles study of magnon-phonon interactions in gadolinium iron garnet
• Direct observation of topological magnon polarons in a multiferroic material
• Enhanced magnon spin transport in NiFe${}_2$O${}_4$ thin films on a lattice-matched substrate
• High pressure tuning of magnon-polarons in the layered antiferromagnet FePS${}_3$
• Room temperature and low-field resonant enhancement of spin Seebeck effect in partially compensated magnets
• Long lifetime of thermally-excited magnons in bulk yttrium iron garnet
• 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
• Magnon-polaron excitations in the noncollinear antiferromagnet Mn${}_3$Ge
• Role of Magnon-Magnon Scattering in Magnon Polaron Spin Seebeck Effect
• Spin-Phonon Interaction in Yttrium Iron Garnet
• Hybridization and Decay of Magnetic Excitations in two-dimensional Triangular Lattice Antiferromagnets
• Microscopic Theory of Ultrafast Out-of-Equilibrium Dynamics in Magnetic Insulators. Unraveling the Magnon-Phonon Coupling
• Neutron Scattering Signature of Phonon Renormalization in Nickel (II) Oxide
• Understanding spin currents from magnon dispersion and polarization: Spin-Seebeck effect and neutron scattering study on Tb3Fe5O12
• Neutron Scattering Study on Yttrium Iron Garnet for Spintronics
• Magnon-polaron formation in XXZ quantum Heisenberg chains
• Magnetization Dynamics in Quasiperiodic Magnonic Crystals
• Terahertz Control of Linear and Nonlinear Magno-Phononics
• Thermal relaxation of magnons and phonons near resonance points in magnetic insulators
• Uncovering Obscured Phonon Dynamics from Powder Inelastic Neutron Scattering using Machine Learning