Dresden 2009 – scientific programme
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MA: Fachverband Magnetismus
MA 30: Spin-Dynamics / Spin-Torque III
MA 30.7: Talk
Thursday, March 26, 2009, 11:45–12:00, HSZ 04
Damping of the domain wall dynamics by phonon and magnon dragging — •Daniel Hähnel, Daniel Steiauf, and Manfred Fähnle — Max-Planck-Institut für Metallforschung, Heisenbergstr. 3, 70569 Stuttgart
The understanding of the damped domain-wall motion, especially in nanoparticles and nanowires, is of central interest for many technological applications. Commonly, the damping of the domain wall is discussed in terms of spin-lattice interactions via spin-orbit coupling. At finite temperatures, however, the movement of the domain walls is also hampered by phonon or magnon dragging, i.e., by transfer of momentum between thermally excited phonons or magnons and the moving domain wall. We present a theory which describes the phonon dragging due to the scattering of phonons at the magnetoelastic strain field of the moving domain wall. The numerical results for this phonon dragging are compared with those obtained for the magnon dragging of domain walls [1].
[1] H. Glock, PhD thesis, University of Stuttgart, 1974.