SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 43: Magnetic Imaging Techniques II
MA 43.7: Vortrag
Donnerstag, 30. März 2023, 16:30–16:45, HSZ 401
Origin of helicity-dependent photoconductivity in magnetic and nonmagnetic wires — •Atul Pandey1,2, Rouven Dreyer1, Palvan Seyidov1, Chris Koerner1, Saban Tirpanci1, Binoy K. Hazra2, Stuart Parkin2, and Georg Woltersdorf1,2 — 1Institute of Physics, Martin Luther University Halle-Wittenberg, Von-Danckelmann-Platz 3, 06120 Halle, Germany — 2Max Planck Institute of Microstructure Physics, Weinberg 2, 06120 Halle, Germany
We study the opto-electric response in metallic wire structures. The aim is to understand the origin of helicity-dependent photoconductivity. For nonmagnetic metals this effect is generally believed to probe spin polarization. Using magnetic wires we show that this method enables background free imaging of spin textures. Analyzing the physical origin we find that the circular dichroism slightly modulates the absorption. The corresponding thermal modulation explains the measured electrical signals. We apply this result to examine the spin Hall effect induced spin accumulation in heavy metals. Here, we show that previously reported results in nonmagnetic wires are well reproducible, but not related to the spin polarization.
A. Pandey et al., Phys. Rev. B 106, 174420 (2022)