Berlin 2015 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 39: Spin-dependent Transport Phenomena I

MA 39.3: Vortrag

Donnerstag, 19. März 2015, 10:00–10:15, H 0112

Anomalous Hall Effect at Terahertz Frequencies — Tom Seifert¹, Frank Freimuth², Lukas Braun¹, Florin Radu³, Ulrike Martens⁴, Markus Münzenberg⁴, Ilie Radu³, Yuriy Mokrousov², Martin Wolf¹, and •Tobias Kampfrath¹ — ¹Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany — ²Forschungszentrum Jülich, Peter Grünberg Institut, 52425 Jülich, Germany — ³Helmholtz-Zentrum Berlin für Materialien und Energie, BESSY II, Albert-Einstein-Straße 15, 12489 Berlin, Germany — ⁴Ernst-Moritz-Arndt Universität, Institut für Physik, Felix-Hausdorff-Str. 6, 17489 Greifswald, Germany

Spin-orbit interaction (SOI) is expected to be of central importance in future spin-based electronics (spintronics) as it permits, for example, the conversion of charge into spin currents. It is highly interesting to study SOI-based effects at terahertz (THz) frequencies because (i) spintronic devices should eventually operate at THz rates and since (ii) the THz photon energy (4 meV at 1 THz) is comparable to the SOI energy in magnetically ordered solids. Here, we employ broadband THz time-domain ellipsometry [1] to measure the complex conductivity tensor of various magnetic metals from 1 to 40 THz. Supported by ab initio calculations [2], we discuss spectral features of the spin Hall angle in terms of SOI.

[1] A. Rubano, L. Braun, M. Wolf, and T. Kampfrath, Appl. Phys. Lett. 101, 081103 (2012).

[2] F. Freimuth, S. Blügel, and Y. Mokrousov, Phys. Rev. Lett. 105, 246602 (2010).