Dzyaloshinskii-Moriya Interaction Enhanced Spin Pumping of an Easy-Plane Antiferromagnet*

Over the past decade, antiferromagnets have received immense interest due to their significant potential for developing ultrafast magnetic information storage. α-Fe₂O₃ is naturally relevant in this context due to its tunable magnetic structure and reduced resonance frequency. Here, we report dc spin pumping by the acoustic resonant mode in the canted easy-plane antiferromagnetic phase of α-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 α-Fe₂O₃/metal-based 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 measured spin pumping signals when the metal layer is switched from platinum to tungsten which has an opposite sign of the spin Hall angle. Our results reveal the intriguing physics underlying the spin dynamics in canted easy-plane antiferromagnets-based heterostructures.