Spin Caloritronics in graphene with Mn

TL;DR

This paper demonstrates that graphene with Mn adatoms exhibits a tunable spin-dependent Seebeck effect, enabling control over spin caloritronic properties via gate potential, with potential for spin current manipulation and thermal magnetoresistance tuning.

Contribution

It introduces a novel graphene-based material with Mn adatoms that can be electrically tuned for advanced spin caloritronic applications.

Findings

Graphene with Mn adatoms shows a spin-dependent Seebeck effect.

Gate potential can switch between spin-polarized and opposite spin currents.

Thermal magnetoresistance can be tuned from -100% to +100%.

Abstract

We show that graphene with Mn adatoms trapped at single vacancies feature spin-dependent Seebeck effect, thus enabling the use of this material for spin caloritronics. A gate potential can be used to tune its thermoelectric properties in a way it presents either a total spin polarized current, flowing in one given direction, or currents for both spins flowing in opposite directions without net charge transport. Moreover, we show that the thermal magnetoresistance can be tuned between $-100\%$ and $+100\%$ by varying agate potential.