Identifying spin-current source materials with a favorable balance among charge to spin conversion, spin transport, electrical conductivity, and interfacial transmission is important for spintronic applications. Here, we investigate spin-current generation in Co/InBi/$\mathrm{A}{\mathrm{l}}_2{\mathrm{O}}_3$ heterostructures using anomalous Hall scaling and thickness-dependent spin Hall magnetoresistance (SMR) measurements. Structural characterizations confirm the formation of highly crystalline and nearly stoichiometric InBi thin films. Hall-scaling analysis indicates that the insertion of InBi substantially modifies spin-orbit-coupled transverse transport through enhanced spin-dependent scattering. More importantly, thickness-dependent SMR measurements reveal efficient spin-current generation in InBi, from which a spin Hall angle of 0.062–0.074 and a spin diffusion length of 5.39–5.80 nm is extracted over 50–300 K. These results demonstrate spin-current generation and spin transport in InBi-based heterostructures and provide insight into spin-orbit-coupled transport in p-orbital-dominated intermetallic thin films.

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• Spintronics