Thermal spin dynamics of yttrium iron garnet

Abstract

Yttrium Iron Garnet is the prototypical material used to study pure spin currents. It is a complex material with 20 magnetic atoms in the unit cell. Almost all theories and experimental analysis approximates this complicated material to a simple ferromagnet with a single spin wave mode. We use the method of atomistic spin dynamics to study the temperature evolution of the full 20 mode exchange spin wave spectrum. Our results show a strong frequency dependence of the modes in quantitative agreement with neutron scattering experiments. We find this causes in a reduction in the net spin pumping due to the thermal occupation of optical modes with the opposite chirality to the FMR mode.

References in corpus (15)

• Spin Caloritronics
• Spin Seebeck insulator
• Long distance transport of magnon spin information in a magnetic insulator at room temperature
• Theory of magnon-driven spin Seebeck effect
• Thermoelectric generation based on spin Seebeck effects
• Magnon spin transport driven by the magnon chemical potential in a magnetic insulator
• Spin transfer torque on magnetic insulators
• Critical suppression of spin Seebeck effect by magnetic fields
• The effect of the magnon dispersion on the longitudinal spin Seebeck effect in yttrium iron garnets (YIG)
• Spin Seebeck effect in antiferromagnets and compensated ferrimagnets
• Origin of the thickness-dependent low-temperature enhancement of spin Seebeck effect in YIG films
• Quantitative Temperature Dependence of Longitudinal Spin Seebeck Effect at High Temperatures
• Propagation of Thermally Induced Magnonic Spin Currents
• Spectral characteristics of time resolved magnonic spin Seebeck effect
• Unified decoupling scheme for exchange and anisotropy contributions and temperature-dependent spectral properties of anisotropic spin systems

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