Dresden 2017 – wissenschaftliches Programm
MA 61.1: Vortrag
Freitag, 24. März 2017, 09:30–09:45, HSZ 401
Quantifying the Dzyaloshinskiǐ Moriya Interaction using traveling waves with stationary envelopes — •Benjamin Zingsem1, R. E. Camley2, R. Salikhov1, R. Meckenstock1, D. Spoddig1, R. L. Stamps3, and M Farle1 — 1Faculty of Physics and Center for Nanointegration (CENIDE), University Duisburg-Essen, 47057 Duisburg, Germany — 2Center for Magnetism and Magnetic Nanostructures, University of Colorado at Colorado Springs, Colorado Springs, Colorado 80918, USA — 3SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, UK
In the presence of Dzyaloshinskii Moriya Interaction (DMI) the magnon dispersion becomes nonreciprocal , meaning that counterpropagating waves of the same frequency have different wavevectors. In this combined experimental and theoretical study, we show that this property implies that spinwave eigenmodes of confined systems, such as nanodots, exibit unusual dynamics i.a. they posess aspects of propagating and standing waves. This new type of *standing wave* results in eigenmodes, emerging at microwave excitations (e.g. ferromagnetic resonance (FMR)), which would be undetectable wihtout DMI. Thus the presence of DMI imposes a unique fingerprint on FMR spectra of confined systems which allows for unambigous quantification of the DMI. 
 J-H Moon, et al. Phys. Rev. B, 88:184404, Nov 2013.  Benjamin W. Zingsem, Michael Farle, Robert L. Stamps, and Robert E. Camley. The unusual nature of confined modes in a chiral system. arXiv:1609.03417, 2016.