A novel method to evaluate spin diffusion length of Pt

TL;DR

This paper introduces a new method to measure the spin diffusion length of platinum by analyzing the thickness dependence of anomalous Hall effect parameters influenced by spin orbit coupling proximity effects.

Contribution

The paper presents a novel approach to evaluate the spin diffusion length in materials with small values using proximity effects and AHE measurements.

Findings

Spin diffusion length of Pt determined via AHE parameters.

Thickness dependence of AHE parameters proportional to SOC strength squared.

Method effective for small spin diffusion lengths.

Abstract

Spin diffusion length of Pt is evaluated via proximity effect of spin orbit coupling (SOC) and anomalous Hall effect (AHE) in Pt/Co2FeAl bilayers. By varying the thicknesses of Pt and Co2FeAl layer, the thickness dependences of AHE parameters can be obtained, which are theoretically predicted to be proportional to the square of the SOC strength. According to the physical image of the SOC proximity effect, the spin diffusion length of Pt can easily be identified from these thickness dependences. This work provides a novel method to evaluate spin diffusion length in a material with a small value.