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MA: Fachverband Magnetismus

MA 21: Terahertz Spintronics

MA 21.6: Vortrag

Mittwoch, 7. September 2022, 10:45–11:00, H43

Spin-orbit interaction at terahertz rates — •Tom S. Seifert and Tobias Kampfrath — FU Berlin

Spintronics aims at implementing the spin degree of freedom into conventional electronics. To be compatible and competitive, spintronic functionalities thus need to keep pace with the ever-increasing speeds of electronic devices that are foreseen to enter the terahertz range eventually [1]. Therefore, one needs to study fundamental spintronic phenomena at terahertz frequencies. Following this approach, one might not only hope to reveal new physics but also to apply these novel insights in terms of innovative terahertz photonic applications. Here, I will discuss our recent experimental efforts to study a central spintronic effect, the anomalous Hall effect (AHE) [2] in metallic magnets from DC to 40 THz. We find a largely frequency-independent AHE in DyCo5, Gd27Fe73 and Co32Fe68, which we attribute to the large Drude scattering rate in metallic thin films. The gained knowledge could further enhance the efficiency of a novel ultrafast spintronic application, namely the spintronic terahertz source [3].

[1] Walowski, J., et al., J. Appl. Phys. 120 (2016). [2] Seifert, T. S., et al. Adv. Mat. 33 (2021). [3] Seifert, T. S., et al. Appl. Phys. Lett. 120 (2022).