Spintronic phenomena to date have been established in magnets with collinear moments, where the spin injection through the spin Seebeck effect (SSE) is always along the out-of-plane direction. Here, we report the observation of a vector SSE in a noncollinear antiferromagnet (AF) LuFeO3, where temperature gradient along the out-of-plane and also the in-plane directions can both inject a pure spin current and generate a voltage in the heavy metal via the inverse spin Hall effect (ISHE). We show that the thermovoltages are due to the magnetization from canted spins in LuFeO3. Furthermore, in contrast to the challenges of generating, manipulating and detecting spin current in collinear AFs, the vector SSE in LuFeO3 is readily viable in zero magnetic field and can be controlled by a small magnetic field of about 150 Oe at room temperature. The noncollinear AFs expand new realms for exploring spin phenomena and provide a new route to low-field antiferromagnetic spin caloritronics and magnonics.
@article{arxiv.2210.06602,
title = {Observation of Vector Spin Seebeck Effect in a Noncollinear Antiferromagnet},
author = {Jinsong Xu and Jiaming He and J. -S. Zhou and Danru Qu and Ssu-Yen Huang and C. L. Chien},
journal= {arXiv preprint arXiv:2210.06602},
year = {2022}
}