Regensburg 2025 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 7: Spins in Molecular Systems: Strategies and Effects of Hyperpolarization
DS 7.6: Vortrag
Mittwoch, 19. März 2025, 11:15–11:30, H14
Microscopic and Macroscopic CISS Effect Characterization: Moving from MBE to Sputter-Deposited Au/Co/Au Substrates — •Lokesh Rasabathina1, Thi Ngoc Ha Nguyen1, Julia Krone1, Annika Morgenstern1, Franziska Schölzel1,2, Markus Gößler1, Karin Leistner1, Aleksandr Kazimir4, Jannik Knoche4, Christina Lamers4, Irene Coin4, Lech Thomasz Baczewski5, Christoph Tegenkamp1, Georgeta Salvan1,2, and Olav Hellwig1,2,3 — 1Chemnitz University of Technology, Chemnitz, Germany — 2Center for Materials, Architectures and Integration of Nanomembranes (MAIN), Chemnitz University of Technology,Chemnitz, Germany — 3Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — 4Leipzig University, Leipzig, Germany — 5Polish Academy of Sciences, Warszawa, Poland.
Adsorption of alpha-helical polyalanine molecules on metallic substrates enables interfacial selective electron transport with a defined spin direction, a phenomenon known as Chirality Induced Spin Selectivity (CISS). We combine microscopic STM/STS of hybrid spin-valve structures with macroscopic MOKE magnetometry for CISS effect characterization on Au/Co/Au substrates. Microscopically we observe magneto resistance changes across the hybrid spin-valve structure and macroscopically we find a coercivity enhancement of the Co layer after exposure to molecules. To use more complex systems, we moved from MBE to sputterd substrates and discuss the challenges related to this transition.
Keywords: CISS; MIPAC; Magneto Optic Kerr Effect; STM/STS; Magnetic thin films