The spin anomalous Hall effect (SAHE), generating spin angular momentum flow (spin current, ${\mathbf{J}}_{\mathrm{s}})$, in an $L{1}_0\text{−}\mathrm{FePt}$ ferromagnet was quantitatively evaluated by exploiting giant magnetoresistance devices composed of $L{1}_0\text{−}\mathrm{FePt}\left|\mathrm{Cu}\right|\mathrm{N}{\mathrm{i}}_{81}\mathrm{F}{\mathrm{e}}_{19}$. From the ferromagnetic resonance linewidth modulated by the charge current $\left({\mathbf{J}}_{\mathrm{c}}\right)$ injection, the spin anomalous Hall angle $\left({\alpha }_{\mathrm{SAHE}}\right)$ was obtained to be 0.25 ± 0.03. The evaluation of ${\alpha }_{\mathrm{SAHE}}$ at different configurations of ${\mathbf{J}}_{\mathrm{c}}$ and magnetization made it possible to discuss the symmetry of SAHE, giving the unambiguous evidence that SAHE is the source of ${\mathbf{J}}_{\mathrm{s}}$. Thanks to the large ${\alpha }_{\mathrm{SAHE}}$, the SAHE-induced magnetization switching was achieved.

• Received 10 May 2019
• Revised 30 September 2019

DOI:https://doi.org/10.1103/PhysRevB.100.144427