  We report spin-to-charge and charge-to-spin conversion at room temperature in
heterostructure devices that interface an archetypal Dirac semimetal, Cd3As2,
with a metallic ferromagnet, Ni0.80Fe0.20 (permalloy). The spin-charge
interconversion is detected by both spin torque ferromagnetic resonance and
ferromagnetic resonance driven spin pumping. Analysis of the symmetric and
anti-symmetric components of the mixing voltage in spin torque ferromagnetic
resonance and the frequency and power dependence of the spin pumping signal
show that the behavior of these processes is consistent with previously
reported spin-charge interconversion mechanisms in heavy metals, topological
insulators, and Weyl semimetals. We find that the efficiency of spin-charge
interconversion in Cd3As2/permalloy bilayers can be comparable to that in heavy
metals. We discuss the underlying mechanisms by comparing our results with
first principles calculations.
