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MA: Fachverband Magnetismus
MA 52: Poster II
MA 52.23: Poster
Thursday, March 15, 2018, 15:00–18:00, Poster C
Spin waves in CoFeB thin films dominated by Dzyaloshinskii-Moriya interaction — •Tobias Fischer1,2, Frank Heussner1, Samridh Jaiswal3,4, Gerhard Jakob3, Mathias Kläui2,3, Burkard Hillebrands1, and Philipp Pirro1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, TU Kaiserslautern, Erwin-Schrödinger-Straße 56, 67663 Kaiserslautern — 2MAINZ Graduate School of Excellence, Staudingerweg 9, 55128 Mainz — 3JGU, Institut für Physik, Staudingerweg 7, 55128 Mainz — 4Singulus Technologies AG, Hanauer Landstraße 103, 63796 Kahl am Main
The asymmetric exchange contribution in ultra-thin magnetic films with both broken inversion symmetry and an adjacent capping material with a large spin-orbit interaction can lead to a strong interfacial Dzyaloshinskii-Moriya interaction (DMI) [1]. As a result, an additional term linear in the spin-wave wave vector appears in the dispersion relation of spin waves. Brillouin light scattering (BLS) spectroscopy is employed to probe the spin-wave spectrum and to determine the DMI constant. We present results of the investigation of the spin-wave spectrum in ultra-thin CoFeB (0.6 nm) films deposited on Pt and W, respectively. For both single and multilayers these findings are compared with results obtained earlier using methods other than BLS. Furthermore, a detailed analysis of the signal peak behavior is provided.
Financial support within the SFB/TRR 173 Spin+X is gratefully acknowledged.
[1] A. A. Stashkevich et al., Phys. Rev. B 91, 214409 (2015).