Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 34: Spin Dynamics and Transport: Magnonics

MA 34.4: Vortrag

Mittwoch, 22. März 2017, 10:15–10:30, HSZ 04

Snell's law for spin waves in a temperature gradient — •Michael Vogel, Johannes Stigloher, Martin Decker, and Christian H. Back — Institut für Experimentelle und Angewandte Physik, Universität Regensburg, Regensburg, Germany

Snell's law [J. W. Shirley. Am. J. Phys. 19, 507 (1951)] describes the relationship between incidencent and refracted parts of a wave in media with different group velocities by following Fermat's principle of least time. It is mainly prominent in optics, but due to only being based upon a translational symmetry argument applicable to many phenomena such as spin waves [J. Stigloher et al. PRL. 117, 037204 (2016)]. The dispersion relation for spin waves depends on the saturation magnetization which depends itself on temperature [7]. Here the transition of spin wave through a locally heated Permalloy film is studied by time resolved MOKE measurements. We show the possibility of changing the direction of spin waves by local manipulation of the temperature landscape.