Parts | Days | Selection | Search | Updates | Downloads | Help

MA: Fachverband Magnetismus

MA 11: Posters Magnetism III

MA 11.23: Poster

Wednesday, September 29, 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 Schmidt^1,2 — 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).