# 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.

## Key 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.

---
Source: https://tomesphere.com/paper/1906.09730