Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 45: Focus Session: Magnon Transport in Metallic Spin Textures
MA 45.3: Hauptvortrag
Mittwoch, 22. März 2017, 17:00–17:30, HSZ 04
Snell's Law for Spin Waves — •Johannes Stigloher1, Martin Decker1, Helmut Koerner1, Kenji Tanabe2, Takahiro Moriyama3, Takuya Taniguchi3, Hiroshi Hata3, Marco Madami4, Gianluca Gubbiotti4, Kensuke Kobayashi5, Teruo Ono3, and Christian Back1 — 1University Regensburg , Regensburg, Germany — 2Nagoya University, Nagoya, Japan — 3Kyoto University, Uji, Japan — 4Universita di Perugia, Perugia, Italy — 5Osaka University, Osaka, Japan
Snell's law is well known in optics and describes refraction of light at the transition between two media with different dispersion relations. In our experiments, we model this transition by a thickness step in a ferromagnetic material. Spin waves are excited in a Permalloy film of 60 nm thickness and propagate into a film of 30 nm thickness. Since these two regions have different dispersion relations [1-3] we are able to observe Snell's law for spin waves by measuring the refraction for a variety of samples with varying incident angles [3]. Snell's law for spin waves deviates from Snell's law in optics, since the spin wave dispersion relation is anisotropic, i.e. it depends strongly on the angle of propagation direction with respect to the external field [4].
[1] K. Tanabe et al., Appl. Phys. Exp. 7, 053001 (2014). [2] J.N. Toedt et al., Phys Rev B 93, 184416 (2016). [3] J. Stigloher et al., Phys. Rev Lett., 117,037204 (2016). [3] B.A. Kalinikos and A.N. Slavin, J. Phys. D: Solid State Physics 19, 7013 (1986).