Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 51: Magnetism Poster B
MA 51.61: Poster
Donnerstag, 4. April 2019, 15:00–18:00, Poster C
2D Maps of Laser Induced Photocurrents in Ferromagnet-Topological Insulator Heterostructures — •Tobias Kleinke1, Thomas Schumann1, Nina Meyer1, Gregor Mussler2, Eva Schmoranzerová3, Petr Němec3, Helena Reichlová4, Tobias Kampfrath5, Christian Heiliger6, and Markus Münzenberg1 — 1Physikalisches Institut, Universität Greifswald, Germany — 2Peter Grünberg Institute (PGI-9), Forschungszentrum Juelich, Germany — 3MFF, Charles University, Prague, Czech Republic — 4FZU, Prague, Czech Republic — 5FHI Berlin, Germany — 6University of Gießen, Germany
Topological insulators provide theoretically dissipationless and 100 % spin polarized conduction channels for electrons. This property make them appealing for spintronic applications.[1] We will present 2D polarization dependend maps of laser induced photocurrents with fixed applied external magnetic field of +/- 30 mT. The sample consists of a topological insulator rectangle with a small 3 nm thick CoFeB rectangle on top. For the edges of the ferromagnet we found a lateral accumulation of spin polarization due to the spin Nernst effect. [2] We can also show that the spin-polarized current is dependend of the direction of the magnetization.
[1] C. L. Kane, E. L. Mele, Phys. Rev. Lett. 95, 146802 (2005)
[2] T. Schumann et al., arXiv:1810.12799