Anomalous Nernst Effects of [CoSiB/Pt] Multilayer Films

TL;DR

This paper investigates the anomalous Nernst effect in [CoSiB/Pt] multilayer films, revealing hysteresis linked to magnetization and a distance-dependent voltage response related to temperature gradients.

Contribution

It provides the first detailed measurement of the anomalous Nernst effect in [CoSiB/Pt] multilayers and explores its dependence on temperature gradients and magnetic properties.

Findings

Nernst voltage exhibits hysteresis similar to anomalous Hall effects.

The voltage depends on distance from heat source as approximately 1/d^1.3.

Temperature gradient effects are consistent with heat equation predictions.

Abstract

We report a measurement for the anomalous Nernst effects induced by a temperature gradient in [CoSiB/Pt] multilayer films with perpendicular magnetic anisotropy. The Nernst voltage shows a characteristic hysteresis which reflects the magnetization of the film as in the case of the anomalous Hall effects. With a local heating geometry, we also measure the dependence of the anomalous Nernst voltage on the distance d from the heating element. It is roughly proportional to 1/d^1.3, which can be conjectured from the expected temperature gradient along the sample from the heat equation.