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Berlin 2024 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 24: Terahertz Spintronics I

MA 24.10: Vortrag

Mittwoch, 20. März 2024, 12:00–12:15, EB 202

Broadband spintronic sampling of true terahertz electric fields — •Alexander Chekhov1, Yannic Behovits1, Julius Heitz1, Maria-Andromachi Syskaki2, Bruno Rosinus Serrano1, Amon Ruge1, Jana Kredl3, Markus Münzenberg3, Gerhard Jakob2, Mathias Kläui2, Tom Seifert1, and Tobias Kampfrath11Department of Physics, Freie Universität Berlin, 14195 Berlin, Germany — 2Institute of Physics, Johannes Gutenberg University Mainz, 55099 Mainz, Germany — 3Institut für Physik, Universität Greifswald, 17489 Greifswald, Germany

The increasing bandwidth of intense terahertz (THz) sources demands the development of new methods for the sampling of broadband THz electromagnetic pulses. Here, we demonstrate a spintronic approach to THz-electric-field detection based on measuring the THz spin accumulation that is induced at a ferromagnet/heavy-metal (FM/HM) interface by a THz electric field. To put this scheme to the test, we apply ultrabroadband THz pulses from a spintronic THz emitter to FM|HM stacks and probe the transient optical birefringence. We find that the measured signal has the same shape as the driving THz field without any distortions over the full range of 0.1-12 THz. By studying various FM|HM stacks, we reveal the mechanism behind the observed signals and maximize the detector efficiency. Our work not only provides new opportunities in THz photonics but also new insights into THz spin dynamics at interfaces.

Keywords: Terahertz detection; Spin accumulation; Spintronic terahertz emitter; Interface physics

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