Effect of Spin Accumulation at Co/Pt Interfaces on Anomalous Hall Effect in Pt/Co/Pt Trilayers

TL;DR

This study investigates how spin accumulation at Co/Pt interfaces influences the anomalous Hall effect in Pt/Co/Pt trilayers, revealing dependence on Pt layer thickness and spin diffusion length through experiments and calculations.

Contribution

It demonstrates the impact of spin accumulation on the anomalous Hall coefficient in Pt/Co/Pt trilayers, highlighting the role of Pt layer thickness and spin diffusion.

Findings

The anomalous Hall coefficient depends on Pt layer thickness.

Spin accumulation affects the anomalous Hall effect.

The ratio of longitudinal to transverse current increases with Pt thickness.

Abstract

As current flows through a Pt/Co/Pt trilayer, spin Hall effect induced by charge current in the Pt layer leads to spin accumulation at the Co/Pt interfaces. Our experiment and calculation show an indication of the effect of spin accumulation at the Co/Pt interfaces on anomalous Hall coefficient in the Pt/Co/Pt sandwich, which depends on the Pt layer thickness and spin diffusion length in Pt layer. The ratio of the longitudinal current in the Pt cap layer due to anomalous Hall effect to the injected transverse current in the Co layer increases with the Pt cap layer thickness.