SKM 2021 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 11: Posters Magnetism III
MA 11.23: Poster
Mittwoch, 29. September 2021, 13:30–16:30, P
Modulation of Terahertz radiation by current confinement in patterned Ferromagnetic Emitters — •Bikash Das Mohapatra1, Evangelos Th. Papaioannou1, Reza Rouzegar3, Tobias Kampfrath3, and Georg Schmidt1,2 — 1Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, Von-Danckelmann-Platz 3, D-06120 Halle, Germany — 2Interdisziplinäres Zentrum für Meterialwissenschaften, Martin-Luther-Universität Halle-Wittenberg, Heinrich-Damerow-Straße 4, D-06120 Halle, Germany — 3Department of Physical Chemistry, Fritz Haber Institute, Faradayweg 4-6, 14195 Berlin, Germany
Spintronic Ferromagnetic Emitters are novel sources for generation of THz radiation. Various studies have shown the generation of ultrafast transverse charge current from spin current by the Inverse Spin Hall Effect resulting in THz electromagnetic pulses. We have fabricated THz emitters into arrays of geometrical structures using Sputter deposition and e-beam lithography. The structures were micron or sub-micron sized squares and rectangles. Upon fs laser irradiation these emitters show an emission spectrum which is different than for large area reference emitters. We suggest that the confinement[1] results in local charge accumulation that creates additional currents that counteract the initial inverse spin Hall effect.
[1] Z. Jin et al., "Terahertz Radiation Modulated by Confinement of Picosecond Current Based on Patterned Ferromagnetic Heterostructures ", Phys. Stat. Sol. 13, 1900057 (2019).