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American Physical Society, Physical Review Letters, 12(110)

DOI: 10.1103/physrevlett.110.127208

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Staggered Dynamics in Antiferromagnets by Collective Coordinates

Journal article published in 2012 by Erlend G. Tveten, Alireza Qaiumzadeh, O. A. Tretiakov ORCID, Arne Brataas ORCID
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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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. ; Comment: 4 pages, 2 figures