Anomalous Spin and Orbital Hall Phenomena in Antiferromagnetic Systems

We investigate anomalous spin and orbital Hall phenomena in antiferromagnetic materials via orbital pumping experiments. Conducting spin and orbital pumping experiments on YIG/Pt/Ir_{20}Mn_{80} heterostructures, we unexpectedly observe strong spin and orbital anomalous signals in an out-of-plane configuration. We report a sevenfold increase in the signal of the anomalous inverse orbital Hall effect compared to conventional effects. Our study suggests expanding the orbital Hall angle (θ_{OH}) to a rank 3 tensor, akin to the spin Hall angle (θ_{SH}), to explain the anomalous inverse orbital Hall effect. This work pioneers converting spin-orbital currents into charge currents, advancing the spin-orbitronics domain in antiferromagnetic materials.