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MA: Fachverband Magnetismus

MA 21: Poster I

MA 21.43: Poster

Dienstag, 13. März 2018, 09:30–13:00, Poster A

Ultrafast magnetization and spin dynamics driven by terahertz radiation pulses — •Julius Heitz¹, Lukáš Nádvorník¹, Tom Seifert¹, Martin Wolf², and Tobias Kampfrath^1,2 — ¹Freie Universität Berlin, Arnimallee 14, 14195 Berlin — ²Fritz-Haber-Institut der Max Planck Gesellschaft, Faradayweg 4-6, 14195 Berli

Magnetization reversal, spin transfer torque, giant magnetoresistance [1] and the emission of terahertz (THz) radiation [2] are intriguing spintronic applications, each of which relies on well-controlled generation and manipulation of spin currents. The established methods to generate spin currents are the anomalous and spin Hall effects (AHE, SHE), whose inverse were demonstrated recently up to THz frequencies [3]. This makes them excellent candidates to extend the bandwidth of spin information processing into the THz range. However, so far no direct observation of AHE-related ultrafast spin accumulation at sample interfaces has been reported.

In this contribution, we study the interaction of ultrashort intense THz pulses with magnetic thin films. In our experiment, the strong THz electric field (up to ~0.5 MV/cm) is used to drive ultrafast charge currents in the plane of the structure. By using the magnetooptic Kerr effect, we investigate how such excitation and the AHE currents can lead to ultrafast spin and charge redistribution in thin films.

1. C. Chappert, A. Fert, Frédéric Nguyen Van Dau, Nature Materials 6, 813-823 (2007) 2. T. Kampfrath et al., Nature Nanotech. 8, 256 (2013). 3. T. Seifert, M. Wolf, T. Kampfrath et al., Nature Photon. 10, 483 (2016).