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MA: Fachverband Magnetismus
MA 30: Spin-Torque Phenomena
MA 30.7: Talk
Wednesday, March 9, 2016, 11:45–12:00, H33
Snell's Law for Spin Waves — •Johannes Stigloher1, Martin Decker1, Helmut Körner1, Kenji Tanabe2, Takahiro Moriyama3, Takuya Taniguchi3, Hiroshi Hata3, Marco Madami4, Gianluca Gubbiotti4, Kensuke Kobayashi5, Teruo Ono3, and Christian Back1 — 1Department of Physics, Regensburg University, 93053 Regensburg, Germany — 2Department of Physics, Nagoya University, Nagoya, Aichi 464-8602, Japan — 3Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan — 4Dipartimento di Fisica e Geologia, Universita di Perugia, I-06123 Perugia, Italy — 5Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
Snell's law is well known in optics, it describes the refraction of light at the transition between two transparent media. In contrast to light, spin waves in the dipolar regime have an anisotropic dispersion relation and are expected to behave differently at the transition between two media. In our experiments, we model an interface for spin waves by a thickness step: Spin waves are excited in a 60 nm thick Permalloy film by a microwave antenna and propagate into a 30 nm thick film. Utilizing time-resolved scanning Kerr microscopy we can directly track the wave fronts and therefore deduce the changes in the angle of propagation and in the wave vector amplitude at the transition to the thinner film. By measuring the refraction for varying incident angles, we determine Snell's law for spin waves.