Dresden 2020 – wissenschaftliches Programm
Die DPG-Frühjahrstagung in Dresden musste abgesagt werden! Lesen Sie mehr ...
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 16: INNOMAG e. V. Dissertation Prize
MA 16.1: Vortrag
Montag, 16. März 2020, 15:00–15:25, POT 6
Spintronics with Terahertz Radiation: Probing and driving spins at highest frequencies — •Tom S. Seifert1,2 and Tobias Kampfrath2 — 1ETH Zurich — 2Free University Berlin
Spin-orbit interaction (SOI) will be of central importance for future spin-based electronics (spintronics) as it permits charge-to-spin conversion [1]. It is highly interesting to study spin dynamics at terahertz (THz) frequencies because spintronic devices should eventually operate at THz rates. In our experiments, we employ femtosecond optical and THz pulses to trigger ultrafast spin and charge dynamics in magnetic thin-film stacks with a strong SOI. We study THz emission from multilayers of magnetic and nonmagnetic materials [2,3]. By varying the magnet from conducting to insulating and from ferro- to antiferromagnetic, we aim at identifying different mechanisms generating ultrafast spin currents, including super-diffusive spin transport [4] and magnon-mediated transfer of spin angular momentum [5,6]. Finally, we drive spins at highest speeds by switching an antiferromagnetic CuMnAs memory element employing strong THz pulses [7]. These results were obtained in close collaborations with the research groups of J. Barker, C. Ciccarelli, T. Jungwirth, M. Kläui, Y. Mokrousov, M. Münzenberg, P.M. Oppeneer and D. Turchinovich. [1] A. Hoffmann et al., Phys. Rev. Appl. 4 (2015). [2] T. Kampfrath et al., Nat. Nanotech. 8 (2013). [3] T. Seifert et al., Nat. Phot. 10 (2016). [4] M. Battiato et al., PRL 105 (2010). [5] Kurebayashi et al., Nat. Mat. 10 (2011). [6] T. Seifert et al., Nat. Commun. 9 (2018). [7] K. Olejnik et al., Science Adv. 4 (2018).