title: Staggered dynamics in antiferromagnets by collective coordinates.
abstract: Antiferromagnets can be used to store and manipulate spin information, but the coupled dynamics of the staggered field and the magnetization are very complex. We present a theory which is conceptually much simpler and which uses collective coordinates to describe staggered field dynamics in antiferromagnetic textures. The theory includes effects from dissipation, external magnetic fields, as well as reactive and dissipative current-induced torques. We conclude that, at low frequencies and amplitudes, currents induce collective motion by means of dissipative rather than reactive torques. The dynamics of a one-dimensional domain wall, pinned at 90° at its ends, are described as a driven harmonic oscillator with a natural frequency inversely proportional to the length of the texture.
authors.affiliation: Department of Physics, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway.
authors.forename: Erlend G
authors.initials: EG
authors.lastname: Tveten
authors.affiliation: Department of Physics, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway.
authors.forename: Alireza
authors.initials: A
authors.lastname: Qaiumzadeh
authors.affiliation: Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan and Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843-4242, USA.
authors.forename: O A
authors.initials: OA
authors.lastname: Tretiakov
authors.affiliation: Department of Physics, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway.
authors.forename: Arne
authors.initials: A
authors.lastname: Brataas