SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 22: Terahertz Spintronics
MA 22.2: Vortrag
Dienstag, 28. März 2023, 15:15–15:30, POT 6
Terahertz probing of interfacial Curie temperatures in spintronic thin-film stacks — •Oliver Gueckstock1, Reza Rouzegar1, Vincent Baltz2, Gerhard Jakob3, Mathias Kläui3, Tom S. Seifert1, and Tobias Kampfrath1 — 1FU Berlin, Germany — 2SPINTEC, France — 3JGU Mainz, Germany
Transport of spin angular momentum and spin-charge-current interconversion are fundamental operations for future spin-electronic devices. Femtosecond laser pulses are well suited to trigger ultrafast spin transport from a ferromagnetic metal F into an adjacent paramagnetic layer P [1,2]. The inverse spin Hall effect converts the spin current into an in-plane charge current that gives rise to the emission of an electromagnetic pulse with frequencies extending into the terahertz (THz) range. As the ultrafast currents are confined to only ~1 nm around the F/P interface, the emitted THz pulse is expected to be a highly sensitive probe of interface properties. Here, we investigate the impact of the F/P interface morphology and sample temperature on the THz-emission signal. We find that the temperature-dependence of the THz emission signal depends critically on the roughness of the F/P interface. We conclude that the Curie temperature of F at the F/P interface is strongly reduced relative to the bulk by the higher degree of disorder at the F/P interface.
References [1] T. Seifert et al., Nature Photonics 10, 483 (2016). [2] R. Rouzegar et al., Physical Review B 106, 144427 (2022).