title: Gilbert damping in noncollinear ferromagnets.
abstract: The precession and damping of a collinear magnetization displaced from its equilibrium are well described by the Landau-Lifshitz-Gilbert equation. The theoretical and experimental complexity of noncollinear magnetizations is such that it is not known how the damping is modified by the noncollinearity. We use first-principles scattering theory to investigate transverse domain walls (DWs) of the important ferromagnetic alloy Ni80Fe20 and show that the damping depends not only on the magnetization texture but also on the specific dynamic modes of Bloch and Néel DWs in ways that were not theoretically predicted. Even in the highly disordered Ni80Fe20 alloy, the damping is found to be remarkably nonlocal.
authors.affiliation: Faculty of Science and Technology and MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.
authors.forename: Zhe
authors.initials: Z
authors.lastname: Yuan
authors.affiliation: Department of Physics, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway and Niels Bohr International Academy and the Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark.
authors.forename: Kjetil M D
authors.initials: KM
authors.lastname: Hals
authors.affiliation: Faculty of Science and Technology and MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.
authors.forename: Yi
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Faculty of Science and Technology and MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.
authors.forename: Anton A
authors.initials: AA
authors.lastname: Starikov
authors.affiliation: Department of Physics, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway.
authors.forename: Arne
authors.initials: A
authors.lastname: Brataas
authors.affiliation: Faculty of Science and Technology and MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.
authors.forename: Paul J
authors.initials: PJ
authors.lastname: Kelly