Damping of parametrically excited magnons in the presence of the longitudinal spin Seebeck effect

Abstract

The impact of the longitudinal spin Seebeck effect (LSSE) on the magnon damping in magnetic-insulator/nonmagnetic-metal bilayers was recently discussed in several reports. However, results of those experiments can be blurred by multimode excitation within the measured linewidth. In order to avoid possible intermodal interference, we investigated the damping of a single magnon group in a platinum covered Yttrium Iron Garnet (YIG) film by measurement of the threshold of its parametric excitation. Both dipolar and exchange spin-wave branches were probed. It turned out that the LSSE-related modification of spin-wave damping in a micrometer-thick YIG film is too weak to be observed in the entire range of experimentally accessible wavevectors. At the same time, the change in the mean temperature of the YIG layer, which can appear by applying a temperature gradient, strongly modifies the damping value.

arXiv comment5 pages, 4 figures

References in corpus (14)

• Spin Caloritronics
• Theory of magnon-driven spin Seebeck effect
• Spin pumping by parametrically excited exchange magnons
• Magnon, phonon and electron temperature profiles and the spin Seebeck effect in magnetic insulator/normal metal hybrid structures
• Determination of the origin of the spin Seebeck effect - bulk vs. interface effects
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• Sign of inverse spin Hall voltages generated by ferromagnetic resonance and temperature gradients in yttrium iron garnet|platinum bilayers
• Heat-induced damping modification in YIG/Pt hetero-structures
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• Spin-wave propagation and transformation in a thermal gradient
• Thermally-driven spin torques in layered magnetic insulators
• Field-induced transition from parallel to perpendicular parametric pumping for a microstrip transducer
• Spin Seebeck effect at microwave frequencies
• Bose-Einstein Condensation of Magnons Pumped by the Bulk Spin Seebeck Effect

Cited by in corpus (4)

• Temperature dependent relaxation of dipole-exchange magnons in yttrium iron garnet films
• Spin Seebeck effect and ballistic transport of quasi-acoustic magnons in room-temperature yttrium iron garnet films
• Role of magnons and the size effect in heat transport through an insulating ferromagnet/insulator interface
• Ellipticity and Dissipation Effects in Magnon Spin Valves