Ellipticity and Dissipation Effects in Magnon Spin Valves

TL;DR

This paper investigates how ellipticity and dissipation influence spin and heat transport in magnon spin valves, revealing unique tunneling channels and differences from electronic spin transport, relevant for magnetic insulator devices.

Contribution

It introduces a detailed analysis of ellipticity and damping effects on magnon tunneling in spin valves, highlighting their role in transport properties and device applications.

Findings

Ellipticity and damping enable magnon tunneling in antiparallel configurations.

Transport properties depend on Gilbert damping and ellipticity.

Distinct behavior from electronic spin transport in similar structures.

Abstract

We consider alignment-dependent spin and heat transport across a magnon spin valve in the tunneling regime, i.e., a junction consisting of two weakly coupled ferromagnetic insulators. We determine the difference in spin and heat conductance between the parallel and antiparallel configuration of the magnetization direction. The dependence of these conductances on both the Gilbert damping and ellipticity is studied. We find that both magnon ellipticity and dissipation open channels for magnons to tunnel through in the antiparallel configuration. Our results highlight an important difference between electronic and magnon spin transport in spin-valve structures and may be important for the development of devices based on magnetic insulators.