  Recently, antiferromagnets have received revived interest due to their
significant potential for developing next-generation ultrafast magnetic
storage. Here we report dc spin pumping by the acoustic resonant mode in a
canted easy-plane antiferromagnet {\alpha}-Fe2O3 enabled by the
Dzyaloshinskii-Moriya interaction. Systematic angle and frequency dependent
measurements demonstrate that the observed spin pumping signals arise from
resonance-induced spin injection and inverse spin Hall effect in
{\alpha}-Fe2O3/metal heterostructures, mimicking the behavior of spin pumping
in conventional ferromagnet/nonmagnet systems. The pure spin current nature is
further corroborated by reversal of the polarity of spin pumping signals when
the spin detector is switched from platinum to tungsten which has an opposite
sign of the spin Hall angle. Our results highlight the potential opportunities
offered by the low-frequency acoustic resonant mode in canted easy-plane
antiferromagnets for developing next-generation, functional spintronic devices.
