Room temperature antiferromagnetic resonance and inverse spin-Hall voltage in canted antiferromagnets

TL;DR

This paper demonstrates room temperature spin pumping and inverse spin-Hall voltage generation in canted antiferromagnets, combining theoretical and experimental approaches to reveal new methods for high-frequency spin current detection.

Contribution

It provides the first combined theoretical and experimental evidence of room temperature spin pumping and inverse spin-Hall voltages in canted antiferromagnets with Dzyaloshinskii-Moriya interaction.

Findings

Observable inverse spin-Hall voltages in hematite/heavy metal bilayers.

Sign of voltage indicates mode handedness, confirmed by comparisons.

Potential for terahertz frequency spin-current generation in antiferromagnets.

Abstract

We study theoretically and experimentally the spin pumping signals induced by the resonance of canted antiferromagnets with Dzyaloshinskii-Moriya interaction and demonstrate that they can generate easily observable inverse spin-Hall voltages. Using a bilayer of hematite/heavy metal as a model system, we measure at room temperature the antiferromagnetic resonance and an associated inverse spin-Hall voltage, as large as in collinear antiferromagnets. As expected for coherent spin-pumping, we observe that the sign of the inverse spin-Hall voltage provides direct information about the mode handedness as deduced by comparing hematite, chromium oxide and the ferrimagnet Yttrium-Iron Garnet. Our results open new means to generate and detect spin-currents at terahertz frequencies by functionalizing antiferromagnets with low damping and canted moments.