Magnons and Phonons Optically Driven Out of Local Equilibrium in a Magnetic Insulator

Abstract

Magnons are the energy quanta of fundamental spin excitations, namely spin waves, and they can make a considerable contribution to energy transport in some magnetic materials in a similar manner as lattice vibration waves or phonons. The coupling and possible non-equilibrium between magnons and other energy carriers have been used to explain several recently discovered thermally driven spin transport and energy conversion phenomena. Here, we report experiments in which local non-equilibrium between magnons and phonons in a single crystalline bulk magnetic insulator, Y3Fe5O12 (yttrium iron garnet, or YIG), has been created optically within a focused laser spot and probed directly with the use of micro-Brillouin light scattering (BLS). By analyzing the experimental results with a thermally induced magnon diffusion model, we obtain the magnon diffusion length of thermal magnons. By explicitly establishing non-equilibrium between magnons and phonons, our studies represent an important step toward a quantitative understanding of various spin-heat coupling phenomena.

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Cited by in corpus (23)

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• Spin and spin current -- From fundamentals to recent progress
• Spin Seebeck Effect: Sensitive Probe for Elementary Excitation, Spin Correlation, Transport, Magnetic Order, and Domains in Solids
• All-optical cryogenic thermometry based on NV centers in nanodiamonds
• Bright and dark states of two distant macrospins strongly coupled by phonons
• Finite temperature magnon spectra in yttrium iron garnet from mean field approach in tight-binding model
• Imaging Magnetization Structure and Dynamics in Ultrathin YIG/Pt Bilayers with High Sensitivity Using the Time-Resolved Longitudinal Spin Seebeck Effect
• Tuning the diffusion of magnon in Y3Fe5O12 by light excitation
• Theory of the low-temperature longitudinal spin Seebeck effect
• Quantum Sensing of Spin Fluctuations of Magnetic Insulator Films with Perpendicular Anisotropy
• Prediction of Hot Zone-center Optical Phonons in Laser Irradiated Molybdenum Disulfide with a Semiconductor Multitemperature Model
• Magnonics in collinear magnetic insulating systems
• Non-local magnon transconductance in extended magnetic insulating films.\\ Part I: spin diode effect
• Exciton transport driven by spin excitations in an antiferromagnet
• Frequency-dependent Phonon-mediated Unidirectional Magnetoresistance in a Metal on an Insulator with Highly Nonequilibrium Magnons
• Thermal relaxation of magnons and phonons near resonance points in magnetic insulators
• Electrical manipulation of spin pumping signal through nonlocal thermal magnon transport
• Probing GHz Spin Dynamics Across Magnetic Phase Transitions in CrCl3 Nanoflakes Using Nitrogen-Vacancy Microscopy
• Brillouin-Mandelstam Light Scattering Spectroscopy: Applications in Phononics and Spintronics
• The studies on phonons and magnons in (Ni80Fe20/Au/Co/Au) multilayers of different number of repetitions