Nanoscale control of heat and spin conductance in artificial spin chains

TL;DR

This paper demonstrates how to control heat and spin currents in an artificial spin chain using thermal baths, RF pumping, and static magnetic fields, enhancing transport properties for magnonic devices.

Contribution

It introduces a mechanism for independent control of thermal and spin currents in a nano-scale spin chain using magneto-dipolar interactions, RF pumping, and static fields.

Findings

Transport is enhanced by RF pump field resonating with spin-wave modes.

Independent control of heat and spin currents is achieved via static magnetic fields.

The mechanism suggests potential for improved magnonic device performance.

Abstract

We describe a mechanism to control energy and magnetisation currents in an artificial spin-chain, consisting of an array of Permalloy nano-disks coupled through the magneto-dipolar interaction. The chain is kept out of equilibrium by two thermal baths with different temperatures connected to its ends, which control the current propagation. Transport is enhanced by applying a uniform radio frequency pump field resonating with some of the spin-wave modes of the chain. Moreover, the two currents can be controlled independently by tuning the static field applied on the chain. Thus we describe two effective means for the independent control of coupled currents and the enhancement of thermal and spin-wave conductivity in a realistic magnonics device, suggesting that similar effects could be observed in a large class of nonlinear oscillating systems.