Anomalous-Nernst and anisotropic magnetoresistive heating in a lateral spin valve

TL;DR

This paper investigates thermoelectric effects in a lateral spin valve, measuring the anomalous Nernst effect and magnetoresistive heating, supported by a finite-element model to analyze heat profiles and magnetic behavior.

Contribution

It introduces a comprehensive electrical measurement approach combined with a 3D thermoelectric model to quantify the anomalous Nernst coefficient and magnetization angles in a spin valve.

Findings

Anomalous Nernst coefficient of Permalloy determined as Rn=0.13

Maximum magnetization angle before switching is 8 degrees

Heat profiles elucidate thermoelectric effects in the device

Abstract

We measured the anomalous-Nernst effect and anisotropic magnetoresistive heating in a lateral multiterminal Permalloy/Copper spin valve using all-electrical lock-in measurements. To interpret the results, a three-dimensional thermoelectric finite-element-model is developed. Using this model, we extract the heat profile which we use to determine the anomalous Nernst coefficient of Permalloy Rn=0.13 and also determine the maximum angle of theta=8 degrees of the magnetization prior to the switching process when an opposing non-collinear 10$^{\circ}$ magnetic field is applied.