Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 7: Poster Magnetism I
MA 7.46: Poster
Montag, 9. März 2026, 09:30–12:30, P2
Unidirectional Rashba-Edelstein Magnetoresistance in Topological Insulator-based magnetic Heterostructures — •Steffen Kober1, Ruslan Salikhov2, Jan Deinert2, Igor Ilyakov2, Alexey Ponomaryov2, Atiqa Arshad2, Thales Oliveira2, Kang Jin2, Gulloo Prajapati2, Patrik Pilch1, Anneke Reinold1, Sergio Valenzuela3, Carmen Gómez Carbonell3, Zhe Wang1, and Sergey Kovalev1 — 1TU Dortmund, Department of Physics, Dortmund, Germany — 2Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — 3Catalan Institute of Nanoscience and Nanotechnology
Our recent experimental study of transition metal-based heterostructures has demonstrated that the unidirectional spin-Hall magnetoresistance remains active even at picosecond timescales. Here, we report on experimental investigations of the unidirectional Rashba-Edelstein magnetoresistance in topological insulator (TI)-based magnetic heterostructures, in particular, on the nonlinear terahertz (THz) responses in TI/Al/NiFe/Al thin films. The Rashba-Edelstein effect lifts the spin degeneracy due to inversion symmetry breaking at the interface of the TI, enhancing spin-dependency in the momentum space. We use anisotropic THz second harmonic generation to characterize the Rashba-Edelstein magnetoresistance. To separate this from other possible contributions, such as the thermally driven spin-Seebeck effect, we study samples with varying aluminum layer thicknesses between the TI and the ferromagnetic NiFe, which modifies spin propagation and proximity effects between the ferromagnet and the TI's spin texture.
Keywords: Magnetoresistance; Rashba-Edelstein Effect; Topological-Insulator Heterostructures; Terahertz Spintronics