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MA: Fachverband Magnetismus

MA 66: Poster 3

MA 66.25: Poster

Freitag, 24. März 2017, 09:30–13:00, P2-OG2

Generation of ultrashort current pulses by the inverse spin Hall effect — •Jonathan Weber and Georg Woltersdorf — Martin Luther Universität Halle-Wittenberg

We use optical pump pulses to generate current pulses using the spin-dependent Seebeck effect and the inverse spin Hall effect (ISHE) in normal metal/ferromagnet bilayers. For this the bilayer structures are used to terminate a coplanar waveguide. The optical excitation from an ultrafast amplified laser system injects an ultrashort spin current pulse into the ferromagnetic layer via the spin-dependent Seebeck effect [1]. Subsequently, this spin current pulse is converted into a charge current pulse inside the normal metal layer via the ISHE. The electric signal that is generated by the ISHE is recorded by a fast sampling oscilloscope with a bandwidth of approximately 50 ps. Based on other experiments we expect an actual pulse length of only a few hundred femtoseconds [1, 2]. By normalizing the ISHE signals to the pump pulse energy we find an optical pulse to THz pulse conversion efficiency that is comparable to the tilted pulse front approach [3].

[1] A. Melnikov. et. al.: arXiv:1606.03614[physics.optics] (2016)

[2] T. Seifert, T. Kampfrath, et. al.: doi:10.1038/nphoton.2016.91

[3] H. Hirori, et.al.: Appl. Phys. Lett. 98, 091106 (2011)