Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 64: Poster 1
MA 64.55: Poster
Freitag, 24. März 2017, 09:30–13:00, P2-EG
Spin waves in CoFeB thin films dominated by Dzyaloshinskii-Moriya interaction — •Tobias Fischer1,2, Frank Heussner1, Mathias Kläui2,3, Burkard Hillebrands1, and Philipp Pirro1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, Tech- nische Universität Kaiserslautern, Erwin-Schrödinger-Straße 56, 67663 Kaiserslautern — 2MAINZ Graduate School of Excellence, Staudinger- weg 9, 55128 Mainz — 3Johannes Gutenberg-Universität, Institut für Physik, Staudingerweg 7, 55128 Mainz
As predicted by Dzyaloshinskii and Moriya, in low-symmetry systems the exchange interaction exhibits an antisymmetric contribution. This effect also occurs in ultra-thin films where both the broken inversion symmetry and the selection of a capping material with a large spin-orbit interaction can lead to a strong interfacial Dzyaloshinskii-Moriya interaction (DMI) [1]. In consequence, an additional term which is linear in the spin-wave wave vector enters the dispersion relation of spin waves propagating perpendicular to the static magnetization.
We present results of the investigation of the spin-wave spectrum in ultra-thin CoFeB (0.6 nm) films covered with Pt and W, respectively, employing wave-vector resolved Brillouin light scattering spectroscopy. We find a strong influence of the DMI which leads to a collinear group velocity for both positive and negative wave vectors raising interesting questions on the nature of scattering processes in such systems.
Financial support within the SFB/TRR 173 Spin+X is gratefully acknowledged.
[1] A. A. Stashkevich et al., Phys. Rev. B 91, 214409 (2015).