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

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.