SKM 2021 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 1: Surface Magnetism (joint session MA/O)
MA 1.2: Vortrag
Montag, 27. September 2021, 10:30–10:45, H5
The effect of trapped Helium atoms on spin polarized tunneling in an STM tunnel junction — •Christopher Trainer1, Chi Ming Yim1,2, Christoph Heil3, Vladimir Tsurkan4,5, Alois Loidl4, Liam Farrar1, and Peter Wahl1 — 1SUPA, School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, UK — 2Tsung Dao Lee Institute & School of Physics and Astronomy,Shanghai Jiao Tong University, Shanghai, 200240, China — 3Institute of Theoretical and Computational Physics, Graz University of Technology, NAWI Graz, 8010 Graz, Austria — 4Center for Electronic Correlations and Magnetism, Experimental Physics V, University of Augsburg, D-86159 Augsburg, Germany — 5Institute of Applied Physics, MD 2028 Chisinau, Republic of Moldova
I will present a study of the influence of a Helium probe particle on spin-polarized imaging with an STM. Helium was inserted into the junction between a magnetic Iron tip and an Iron Telluride sample. From tunneling spectra acquired at different tip-sample distances we have mapped out the binding energy of the Helium atom in the tunneling junction. We find that imaging with Helium trapped in the tunneling junction makes the STM sensitive to the magnetic exchange interaction between the tip and the sample. I will demonstrate that by changing the tip sample separation the intensity of the imaged magnetic order can be both enhanced and suppressed and that the overall spin polarization of the junction can be tuned by varying the bias voltage, effectively enabling voltage-control of the spin-polarization of the tunneling current across the junction.