Magnonic spin Joule heating and rectification effects

TL;DR

This paper theoretically explores nonlinear magnonic effects in superconductor-ferromagnet hybrids, revealing magnonic spin-Joule heating, tunable conductances, and hysteretic rectification, advancing understanding of thermal physics and device functionalities in magnonics.

Contribution

It introduces the concept of magnonic spin-Joule heating and demonstrates tunable spin and thermal conductances in superconductor-ferromagnet hybrids with hysteretic rectification effects.

Findings

Magnonic spin-Joule heating occurs due to finite magnon chemical potential.

Interface exhibits large tunability of spin and thermal conductances.

Hysteretic I-V characteristics arise from superconducting state bistability.

Abstract

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 finite magnon chemical potential, we theoretically demonstrate magnonic spin-Joule heating, the spin analogue 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 non-conserved 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.