Large Spin Anomalous Hall Effect in L1$\rm_{0}$-FePt: Symmetry and Magnetization Switching

TL;DR

This paper reports a large spin anomalous Hall effect in L1₀-FePt, demonstrating its symmetry properties and using it to achieve magnetization switching, with implications for spintronic devices.

Contribution

The study provides the first quantitative evaluation of the spin anomalous Hall angle in L1₀-FePt and demonstrates its use in magnetization switching.

Findings

Spin anomalous Hall angle of 0.25 ± 0.03 in L1₀-FePt

Symmetry analysis confirms SAHE as the source of spin current

Successful magnetization switching induced by SAHE

Abstract

We quantitatively evaluate a spin anomalous Hall effect (SAHE), generating spin angular momentum flow (spin current, $J_{\rm s}$), in an L1$\rm_{0}$-FePt ferromagnet by exploiting giant magnetoresistance devices with L1$\rm_{0}$-FePt / Cu / Ni$\rm_{81}$Fe$\rm_{19}$ . From the ferromagnetic resonance linewidth modulated by the charge current ($J_{\rm c}$) injection, the spin anomalous Hall angle ($ \alpha_{\rm SAH} $) is obtained to be 0.25 $ \pm $ 0.03. The evaluation of $ \alpha_{\rm SAH} $ at different configurations between $J_{\rm c}$ and magnetization enables us to discuss the symmetry of SAHE and gives the unambiguous evidence that SAHE is the source of $J_{\rm s}$. Thanks to the large $ \alpha_{\rm SAH} $, we demonstrate the SAHE-induced magnetization switching.