Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 30: Spin-Dynamics / Spin-Torque III

MA 30.7: Vortrag

Donnerstag, 26. März 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.