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SYSD: Symposium SKM Dissertation Prize 2020

SYSD 1: SKM Dissertation Prize

SYSD 1.2: Hauptvortrag

Montag, 16. März 2020, 09:55–10:20, HSZ 02

Spintronics with Terahertz Radiation: Probing and driving spins at highest frequencies — •Tom Sebastian Seifert¹ and Tobias Kampfrath² — ¹ETH Zurich, Switzerland — ²Free University Berlin, Germany

In spintronics, the spin of the electron is envisioned to enable novel functionalities for data processing [1]. As state-of-the-art information technology is approaching the terahertz (THz) frequency range [2], a central question is if important spintronic effects remain operative at THz rates. Important examples include the spin Seebeck effect [4] and the spin (dependent) Hall effects [3], which allow for the generation and interconversion of spin and charge currents, respectively. Here, we will address the high-frequency realization of these key spintronic transport effects and demonstrate their functionality on sub-picosecond time scales [5,6]. We use these insights to design efficient spintronic emitters of terahertz electromagnetic pulses [5] and to operate an antiferromagnetic memory cell employing strong terahertz writing pulses [7]. The presented work involved close collaborations with the research groups of M. Kläui, Y. Mokrousov, D. Turchinovich, M. Münzenberg, G. Woltersdorf, S. Gönnenwein, P. Oppeneer, C. Chiccarelli, P. Brouwer, and T. Jungwirth.

[1] V. Baltz et al., Rev. Mod. Phys. 90 (2018). [2] J. Walowski et al., J. Appl. Phys. 120 (2016). [3] J. Sinova et al., Rev. Mod. Phys. 87 (2015). [4] K. Uchida et al., Nature 455 (2008) [5] T. S. Seifert et al., Nat. Phot. 10 (2016). [6] T. S. Seifert et al., Nat. Commun. 9 (2018). [7] K. Olejnik, T. S. Seifert et al., Science Adv. 4 (2018).