Magnonic spin Joule heating and rectification effects

Nonlinear devices, such as transistors, enable contemporary computing technologies. We theoretically investigate nonlinear effects, bearing a high fundamental scientific and technical relevance, in magnonics with emphasis on superconductor-ferromagnet hybrids. Accounting for a finite magnon chemical potential, we theoretically demonstrate magnonic spin Joule heating, the spin analog of conventional electronic Joule heating. Besides suggesting a key contribution to magnonic heat transport in a broad range of devices, it provides insights into the thermal physics of nonconserved bosonic excitations. Considering a spin-split superconductor self-consistently, we demonstrate its interface with a ferromagnetic insulator to harbor large tunability of spin and thermal conductances. We further demonstrate hysteretic rectification I-V characteristics in this hybrid, where the hysteresis results from the superconducting state bistability.

Automated summary

This theoretical study investigates nonlinear effects in magnonics, with a focus on superconductor-ferromagnet hybrids. The research demonstrates the magnonic spin Joule heating and provides insights into the thermal physics of nonconserved bosonic excitations. It also shows the tunability of spin and thermal conductances at the interface of a spin-split superconductor with a ferromagnetic insulator. Additionally, the study reveals hysteretic rectification characteristics resulting from the bistability of the superconducting state in this hybrid system.