Magnon instability driven by heat current in magnetic bilayers

Abstract

We theoretically demonstrate that, in a ferromagnet/paramagnet bilayer, a magnon instability accompanied by a gigahertz microwave emission can be driven simply by means of a temperature bias. Employing many-body theory for investigating the effects of a phonon heat current on the magnon lifetime, we show that the magnon instability occurs upon the suppression of the Umklapp scattering at low temperatures, leading to microwave emission. The present finding provides crucial information about the interplay of spin current and heat current.

9pages, 3figures

References in corpus (7)

• Spin Seebeck insulator
• Long distance transport of magnon spin information in a magnetic insulator at room temperature
• Observation of the Spin-Seebeck Effect in a Ferromagnetic Semiconductor
• Theory of magnon-driven spin Seebeck effect
• Thermal Spin-Transfer Torques in Magnetoelectronic Devices
• Enhanced DC Spin Pumping into a Fluctuating Ferromagnet near Tc
• Magnon-drag thermopile

Cited by in corpus (4)

• Spin caloritronic nano-oscillator
• Spin pumping into superconductors: A new probe of spin dynamics in a superconducting thin film
• Thermally-driven spin torques in layered magnetic insulators
• Spin pumping into a spin glass material