Bose-Einstein Condensation of Magnons Pumped by the Bulk Spin Seebeck Effect

Abstract

We propose inducing Bose-Einstein condensation of magnons in a magnetic insulator by a heat flow oriented toward its boundary. At a critical heat flux, the oversaturated thermal gas of magnons accumulated at the boundary precipitates the condensate, which then grows gradually as the thermal bias is dialed up further. The thermal magnons thus pumped by the magnonic bulk (spin) Seebeck effect must generally overcome both the local Gilbert damping associated with the coherent magnetic dynamics as well as the radiative spin-wave losses toward the magnetic bulk, in order to achieve the threshold of condensation. We quantitatively estimate the requisite bias in the case of the ferrimagnetic yttrium iron garnet, discuss different physical regimes of condensation, and contrast it with the competing (so-called Doppler-shift) bulk instability.

4 pages, 1 figure

References in corpus (14)

• Spin Transfer Torques
• Spin Seebeck insulator
• Long distance transport of magnon spin information in a magnetic insulator at room temperature
• Generation of coherent spin-wave modes in Yttrium Iron Garnet microdiscs by spin-orbit torque
• Superfluid spin transport through antiferromagnetic insulators
• Electronic control of the spin-wave damping in a magnetic insulator
• Anti-damping spin transfer torque through epitaxial Nickel oxide
• Long range pure magnon spin diffusion observed in a non-local spin-Seebeck geometry
• Two-Fluid Theory for Spin Superfluidity in Magnetic Insulators
• Dynamic phase diagram of dc-pumped magnon condensates
• Spin Hall phenomenology of magnetic dynamics
• Landau-Lifshitz theory of the thermomagnonic torque
• Thermally-driven spin torques in layered magnetic insulators
• Probing excitations in insulators via injection of spin-currents

Cited by in corpus (16)

• Antiferromagnetic spintronics
• Magnetization oscillations and waves driven by pure spin currents
• Bose-Einstein Condensation of Quasi-Particles by Rapid Cooling
• Perspective: non-Hermitian physics in magnetic systems
• Quantum-impurity relaxometry of magnetization dynamics
• Evidence for spin current driven Bose-Einstein condensation of magnons
• Charge Density Wave Hampers Exciton Condensation in 1T-TiSe${}_2$
• Local thermomagnonic torques in two-fluid spin dynamics
• Bose-Einstein condensation of photons in a plasma
• Perspectives on spin hydrodynamics in ferromagnetic materials
• Thermal effects in spintronic materials and devices: an experimentalist's guide
• Stabilization of a nonlinear bullet coexisting with a Bose-Einstein condensate in a rapidly cooled magnonic system driven by a spin-orbit torque
• Short-range Thermal Magnon Diffusion in Magnetic Garnet
• Anisotropy-assisted magnon condensation in ferromagnetic thin films
• Non-local magnon transconductance in extended magnetic insulating films.\\ Part I: spin diode effect
• Damping of parametrically excited magnons in the presence of the longitudinal spin Seebeck effect