Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 78: Correlated Electrons: Poster Session

TT 78.43: Poster

Donnerstag, 10. März 2016, 15:00–18:30, Poster D

Magnetic Linear Dichroism of Collective Spin Excitations in a Chiral Magnet — •Ioannis Stasinopoulos¹, Stefan Weichselbaumer¹, Andreas Bauer², Helmuth Berger³, Johannes Waizner⁴, Markus Garst⁴, Christian Pfleiderer² und Dirk Grundler^1,5 — ¹Physik-Department E10, TU München, Garching, Germany — ²Physik-Department E51, TU München, Garching, Germany — ³IMX, EPFL, Lausanne, Switzerland — ⁴Institute for Theoretical Physics, Univ. Köln, Köln, Germany — ⁵LMGN, IMX, EPFL, Lausanne, Switzerland

Skyrmions are spin whirls emerging in chiral-magnets and arranging in a hexagonal lattice with typical lattice constants of several tens of nm. Collective spin excitations in chiral magnets have generated large interest due to their potential for magnetologic and microwave applications. We describe the dynamics of the mean magnetization of the spin helix by considering the ellipticity and gyrotropy of its precession where we find magnetic linear dichroism over a remarkably large parameter range. Combining our calculations with broadband microwave spectroscopy on the insulator Cu₂OSeO₃, we demonstrate how to deliberately address different skyrmion or spin helix modes and induce finite wavevector transfer by using different coplanar waveguides and appropriate sample shapes. This detailed understanding allows to tailor the GHz response of chiral magnets for magnonic and spintronic devices.

Financial support by the DFG via TRR80 and NIM is acknowledged.