Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 43: Magnetization Dynamics III
MA 43.1: Vortrag
Donnerstag, 3. April 2014, 15:00–15:15, HSZ 401
Magneto-elastic modes and magnon lifetime in thin yttrium-iron garnet films — •Andreas Rückriegel1,2 and Peter Kopietz1,2 — 1Institut für Theoretische Physik, Universität Frankfurt — 2Department of Physics, University of Florida
We calculate the effect of the spin-lattice coupling on the magnon spectrum of thin films of the magnetic insulator yttrium-iron garnet. We show that the hybridisation between phonons and magnons generates characteristic phonon peaks in the magnon spectral function and give explicit expressions for the spectral weight of these peaks. We also derive the interaction vertices between magnons and phonons and estimate the resulting phonon contribution to the magnon life-time at room temperature.