Berlin 2024 – scientific programme

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MA: Fachverband Magnetismus

MA 20: Poster I

MA 20.17: Poster

Tuesday, March 19, 2024, 16:30–19:00, Poster A

Magnetization manipulation with Terahertz electric currents — •Holger Grisk¹, Robin Silber², Jakob Walowski¹, and Markus Münzenberg¹ — ¹Institute of Physics, Greifswald, Germany — ²IT4Innovations & Nanotechnology Centre, Ostrava, Czech Republic

Operating electronic devices in the Terahertz band remains challenging. Nevertheless, it is important to meet the escalating need for greater computational capacity. Spintronic Terahertz Emitters (STEs) represent a recent breakthrough, allowing for sub-picosecond electric current transients generation using femtosecond laser pulses. STEs, typically a nanometer-thick ferromagnetic/nonmagnetic metal bilayer, might offer integration into electric circuits. For instance, probing the magnetic stack's response to electric current pulses, demonstrated with older LT-GaAs Terahertz Emitters, can now be achieved using STEs as both the source and detector. To facilitate experiments, we develop a shadow mask for optical lithography using direct laser writing. This mask comprises two STEs connected by a gold wire. Diagnostic pump-probe experiments involve pumping the first STE to induce a current transient, while the second Terahertz Emitter's magnetization dynamics are probed using the Time-Resolved Magneto-Optic Kerr Effect (TR MOKE).

Keywords: Spintronic Terahertz Emitter; Ultrafast Magnetism; Optical Lithography; Nano Structure