Spin-current generation by electrical means is among the core phenomena driving the field of spintronics. Using ab initio calculations we show that a room-temperature metallic collinear antiferromagnet RuO_{2} allows for highly efficient spin-current generation, arising from anisotropically spin-split bands with conserved up and down spins along the Néel vector axis. The zero net moment antiferromagnet acts as an electrical spin splitter with a 34° propagation angle between spin-up and spin-down currents. The corresponding spin conductivity is a factor of 3 larger than the record value from a survey of 20 000 nonmagnetic spin-Hall materials. We propose a versatile spin-splitter-torque concept circumventing limitations of spin-transfer and spin-orbit torques in present magnetic memory devices.

Department of Applied Physics Tohoku University Sendai 980 8579 Japan

Faculty of Mathematics and Physics Charles University Prague Ke Karlovu 3 121 16 Prague 2 Czech Republic

Grup de Investigación en Física Aplicada Departamento de Física Universidad del Norte Barranquilla 081008 Colombia

Institut für Physik Johannes Gutenberg Universität Mainz D 55099 Mainz Germany

Institute of Physics Czech Academy of Sciences Cukrovarnická 10 162 00 Praha 6 Czech Republic

School of Physics and Astronomy University of Nottingham Nottingham NG7 2RD United Kingdom

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