Chemical Composition Tuning of the Anomalous Hall Effect in Isoelectronic L10 FePd1-xPtx Alloy Films

TL;DR

This study investigates how varying the chemical composition in L10 FePd1-xPtx alloys influences the anomalous Hall effect, revealing tunable intrinsic and extrinsic contributions through spin-orbit coupling modifications.

Contribution

It demonstrates chemical composition tuning as a method to control intrinsic and extrinsic AHE contributions in ferromagnetic alloys, combining experimental and theoretical insights.

Findings

Intrinsic AHE contribution increases with Pt content.

Extrinsic side-jump contribution decreases with Pt content.

Chemical tuning affects the balance of AHE mechanisms.

Abstract

The anomalous Hall effect (AHE) in L10 FePd1-xPtx alloy films is studied both experimentally and theoretically. We find that the intrinsic contribution (?sigma^int_AH) to the AHE can be significantly increased whereas the extrinsic side-jump contribution (sigma^?sj_AH) can be continuously reduced from being slightly larger than sigma^?int_AH in L10 FePd to being much smaller than sigma^?int_AH in L10 FePt, by increasing the Pt composition x. We show that this chemical composition tuning of the intrinsic contribution is afforded by the stronger spin-orbit coupling strength on the Pd/Pt site when the lighter Pd atoms are replaced by the heavier Pt atoms. Our results provide a means of manipulating the competing AHE mechanisms in ferromagnetic alloys for fuller understanding the AHE and also for technological applications of ferromagnetic alloys.