Berlin 2018 – scientific programme
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MA: Fachverband Magnetismus
MA 49: Terahertz dynamics
MA 49.6: Talk
Thursday, March 15, 2018, 16:15–16:30, EB 202
Influence of the electron scattering lifetime onto THz-spintronic experiments — Laura Scheuer1, Sascha Keller1, Garik Torosyan2, Marco Battiato3, René Beigang1,2, and •Evangelos Th. Papaioannou1 — 1Department of Physics and Research Center Optimas, TU Kaiserslautern, Kaiserslautern, 67663, Germany — 2Photonic Center Kaiserslautern, Kaiserslautern, 67663, Germany — 3School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
We show how the THz-E-field amplitude and the bandwidth of the THz radiation, generated by spintronic Fe/Pt bilayer emitters [1], can be optimized by the crystal structure of Pt. By changing the growth parameters, Pt can grow along different crystallographic directions resulting in different degrees of epitaxy on top of Fe. Accordingly, the electron-phonon/defect scattering lifetime at the Fe/Pt interface is modified which influences directly the emitted THz spectrum. We present a theoretical model which correlates the loss of energy of the hot electrons, with the ISHE current that causes the THz emission. By taking into account the response function of the THz detector we describe the influence of the crystal structure of Pt onto the THz signal shape and spectrum. We compare our calculations with experimental data obtained from sample series of Fe(2-12nm)/Pt(2-6 nm).
[1]G. Torosyan et al., arxiv.org/abs/1707.08894 (2017)