Exceptional sign changes of the nonlocal spin Seebeck effect in antiferromagnetic hematite

A.R. and M.K. acknowledge support from the Graduate School of Excellence Materials Science in Mainz (DFG/GSC 266). A.R. and M.K. also acknowledge support from both MaHoJeRo (DAAD Spintronics network, Projects No. 57334897 and No. 57524834) and SPIN+X (DFG SFB TRR 173, No. 268565370 Projects No. A01 and No. B02) and KAUST (Project No. OSR-2019-CRG8-4048.2). This work was supported by the Max Planck Graduate Center with the Johannes Gutenberg-Universitat Mainz (MPGC). A.R., R.L., M.E., U.N., and M.K. acknowledge support from the DFG Project No. 423441604. R.L. acknowledges the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie Grant Agreement FAST No. 752195. This work has received funding from the European Union’s Horizon 2020 research and innovation programme under Grant Agreement No. 863155 (s-Nebula). L.S. acknowledges support by a Mercator fellowship of the DFG. A.D. and L.S. acknowledge the support provided by the Ministry of Innovation and the National Research, Development, and Innovation (NRDI) Office under Projects No. PD124380, No. PD134579, and No. K131938 and through the NRDI Fund (TKP2020 IES, Grant No. BME-IE-NAT). Computing resources for the ab initio calculations were provided by Governmental Information Technology Development Agency’s (KIFU) cluster in Debrecen, Hungary. M.K. acknowledges support by the research council of Norway through its centers of Excellence funding scheme (“QuSpin No. 262633”).