title: Antiferromagnetic Domain Wall Motion Driven by Spin-Orbit Torques.
abstract: We theoretically investigate the dynamics of antiferromagnetic domain walls driven by spin-orbit torques in antiferromagnet-heavy-metal bilayers. We show that spin-orbit torques drive antiferromagnetic domain walls much faster than ferromagnetic domain walls. As the domain wall velocity approaches the maximum spin-wave group velocity, the domain wall undergoes Lorentz contraction and emits spin waves in the terahertz frequency range. The interplay between spin-orbit torques and the relativistic dynamics of antiferromagnetic domain walls leads to the efficient manipulation of antiferromagnetic spin textures and paves the way for the generation of high frequency signals from antiferromagnets.
authors: Department of Materials Science and Engineering, KAIST, Daejeon 34141, Korea.
authors: Takayuki
authors: T
authors: Shiino
authors: Department of Nano-Semiconductor and Engineering, Korea University, Seoul 02841, Korea.
authors: Se-Hyeok
authors: SH
authors: Oh
authors: Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6202, USA.
authors: Paul M
authors: PM
authors: Haney
authors: Department of Materials Science and Engineering, Korea University, Seoul 02841, Korea.
authors: Seo-Won
authors: SW
authors: Lee
authors: Department of Materials Science and Engineering, Korea University, Seoul 02841, Korea.
authors: Gyungchoon
authors: G
authors: Go
authors: Department of Materials Science and Engineering, KAIST, Daejeon 34141, Korea.
authors: Byong-Guk
authors: BG
authors: Park
authors: Department of Nano-Semiconductor and Engineering, Korea University, Seoul 02841, Korea.|Department of Materials Science and Engineering, Korea University, Seoul 02841, Korea.|KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul 02841, Korea.
authors: Kyung-Jin
authors: KJ
authors: Lee