Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 21: Poster I

MA 21.49: Poster

Dienstag, 13. März 2018, 09:30–13:00, Poster A

Spintronic terahertz emitters based on epitaxially grown Fe/Pt, Ta/Fe, Ta/Fe/Pt multilayers — •Laura Scheuer¹, Garik Torosyan², Sascha Keller¹, René Beigang¹, and Evangelos Th. Papaioannou¹ — ¹TU Kaiserslautern, Fachbereich Physik and Landesforschungszentrum OPTIMAS, Germany — ²Photonic Center Kaiserslautern, Germany

We demonstrate the efficient generation of pulsed broadband terahertz radiation utilizing the inverse spin Hall effect in Fe/Pt, Ta/Fe and Ta/Fe/Pt multilayers grown epitaxially on MgO and sapphire substrates. The emitter was optimized with respect to layer thickness, growth parameters, substrates and geometrical arrangement [1]. The experimentally determined optimum layer thicknesses were in qualitative agreement with simulations of the spin current induced in the ferromagnetic layer. Our model takes into account generation of spin polarization, spin diffusion and accumulation in Fe and Ta, Pt and electrical as well as optical properties of the bilayer samples. The general performance makes the spintronic terahertz emitters compatible with established emitters based on optical rectification in nonlinear crystals.

[1] G. Torosyan et al., arxiv.org/abs/1707.08894 (2017)