Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 52: Poster: Electronic structure: Surface Magnetism and Spin Phenomena
O 52.2: Poster
Tuesday, March 13, 2018, 18:15–20:30, Poster B
Visualizing the magnetic structure of Fe bilayers on Ir(111) by atomic manipulation — Nadine Hauptmann1, Melanie Dupé2, •Tzu-Chao Hung1, Alexander K. Lemmens1, Jairo Sinova3, Stefan Heinze3, Daniel Wegner1, Bertrand Dupé2, and Alexander A. Khajetoorians1 — 1Institute for Molecules and Materials, Radboud University, 6525 AJ Nijmegen, Netherlands — 2Institut für Physik, Johannes Gutenberg Universität Mainz, D-55099 Mainz, Germany — 3Institut für Theoretische Physik und Astrophysik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany
Chiral magnetic structures, in which Dzyaloshinskii-Moriya interaction plays an important role on the mechanism of stabilization, have been predicted being a candidate for spintronic applications. By utilizing the combination of spin-polarized scanning tunneling microscope (SP-STM) and magnetic exchange force microscopy (MExFM), or so-called SPEX, we get both the magnetic and geometric sensitivity down to the atomic scale. We apply this method to probe the magnetic structure of the bilayer of Fe on Ir(111), which reveals chiral magnetic order. However, both SP-STM and MExFM do not reveal magnetic contrast of the total unit cell, resulting from the strongly corrugated surface. Therefore, we use the manipulation of iron adatoms, which locally exchange couple with the underlying spin spiral, providing spin information in regions of the unit cell where no magnetic contrast can be observed in SPEX images of the bare surface.