Berlin 2015 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 94: Spin-Dependent Transport Phenomena I (organized by MA)
TT 94.3: Talk
Thursday, March 19, 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).