Abstract
In this study, simple canonical transformation theory is introduced to describe the current-driven magnetization dynamics in collinear antiferromagnets. The theory is confirmed by atomistic level dynamical simulations performed in an antiferromagnetic L10-type MnPt sample. The simulations indicate that when a small spin polarized current is perpendicularly applied to the MnPt sample, a stable initial stationary state remains with a perpendicular antiferromagnetic structure. For a current larger than a threshold, the transition from a stationary state to a stable in-plane precession state is observed without any assistance of magnetic fields, accompanied by a generation of terahertz magnetic signals. The simulations show a good agreement with the analytical theory, from which we could gain a comprehensive understanding of current-induced magnetization dynamics in collinear antiferromagnets at the atomic level.
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