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

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-nonmagnct 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 reveal the intriguing physics underlying the low-frequency spin dynamics and transport in canted easy-plane antiferromagnet-based heterostructures.

Automated summary

This study reports dc spin pumping by the acoustic resonant mode in a canted easy-plane antiferromagnet alpha-Fe2O3. The observed spin-pumping signals in alpha-Fe2O3-metal heterostructures are attributed to resonance-induced spin injection and inverse spin Hall effect, revealing intriguing physics underlying the low-frequency spin dynamics and transport in these structures.