Recently, (101)-oriented $\mathrm{Ru}{\mathrm{O}}_2$ films have been intensively studied because of their ability to generate a spin current with out-of-plane polarization, enabling field-free switching of perpendicular magnetization. This unconventional spin current has typically been attributed to the altermagnetic spin splitting effect in $\mathrm{Ru}{\mathrm{O}}_2$. In this study, we investigate the spin-charge interconversion in $\mathrm{Ru}{\mathrm{O}}_2\left(101\right)$ films through the spin Seebeck effect and spin-orbit torque induced magnetization switching measurements. By comparing the reciprocal relations in $\mathrm{Ru}{\mathrm{O}}_2\left(101\right)$ and the conventional heavy metal Pt, we find that the out-of-plane polarized spin current generated in our $\mathrm{Ru}{\mathrm{O}}_2\left(101\right)$ film is dominated by the anisotropic spin Hall effect. Our work not only enriches the understanding of spin transport in $\mathrm{Ru}{\mathrm{O}}_2$ but also establishes a straightforward and effective approach for distinguishing the altermagnetic spin splitting effect and spin Hall effect.

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• Inverse spin Hall effect
• Magnetotransport
• Spin Hall effect
• Spin current
• Spin polarization