Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 67: Poster 4
MA 67.4: Poster
Freitag, 24. März 2017, 09:30–13:00, P2-OG3
Spin Wave Phase Shift upon Reflection — •Johannes Stigloher1, Takuya Taniguchi2, Martin Decker1, Helmut S. Körner1, Takahiro Moriyama2, Teruo Ono2, and Christian H. Back1 — 1Department of Physics, Regensburg University, 93053 Regensburg, Germany — 2Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
In the experiments presented here, our main observation is a phase shift between incoming and reflected spin waves at an interface between a Permalloy film and a dielectric. Plane spin waves in the dipolar regime are excited by a microwave antenna. By design, the spin waves hit the edge of the film at an angle. An external field is used to tune the wave vector amplitude. It is applied in-plane and aligned parallel to the interface in order to avoid static demagnetizing effects. We detect spin waves by means of a time-resolved scanning Kerr microscope that allows us to directly image the wave fronts [1]. By fitting the interference pattern of incoming and reflected waves, we are able to extract the phase shift in real space. The origin of this shift can be attributed either to an effect similar to the Goos-Hänchen shift in optics or to a finite time delay between the waves. The effect might be used to characterize the interface [2].
[1] J. Stigloher et al. Physical Review Letters, 117, 037204 (2016)
[2] Yu. S. Dadoenkova et al. Applied Physics Letters, 101, 042404 (2012)