Domain wall magneto-Seebeck effect

TL;DR

This paper investigates the magneto-Seebeck effect at a single magnetic domain wall in permalloy nanowires, revealing a clear magneto-Seebeck signature influenced by local spin configurations and magnetization-dependent thermoelectric properties.

Contribution

It demonstrates the existence of a domain wall magneto-Seebeck effect and explains it through the magnetization-dependent Seebeck coefficient and local spin structure.

Findings

Clear magneto-Seebeck signature observed at a single domain wall.

The effect is explained by the magnetization-dependent Seebeck coefficient.

The phenomenon occurs under thermal gradients of a few Kelvin per micrometer.

Abstract

The interplay between charge, spin, and heat currents in magnetic nano systems subjected to a temperature gradient has lead to a variety of novel effects and promising applications studied in the fast-growing field of spincaloritronics. Here we explore the magnetothermoelectrical properties of an individual magnetic domain wall in a permalloy nanowire. In thermal gradients of the order of few Kelvin per micrometer along the long wire axis, we find a clear magneto-Seebeck signature due to the presence of a single domain wall. The observed domain wall magneto-Seebeck effect can be explained by the magnetization-dependent Seebeck coefficient of permalloy in combination with the local spin configuration of the domain wall.