Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 118: Surface Magnetism II (joint session O/MA)
O 118.13: Talk
Friday, March 20, 2020, 13:30–13:45, GER 38
Electronic transport properties in bidimensional ferromagnet GdAu2 with atomic scale resolution — •Alberto Moya1,2,3, David Serrate1,2, M. Ricardo Ibarra1,2, and Matthias Bode3 — 1Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, E-50009 Zaragoza, Spain — 2Instituto de Nanociencia de Aragón, Universidad de Zaragoza, E-50018 Zaragoza, Spain — 3Physikalisches Institut, Lehrstuhl für Experimentelle Physik 2, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
Electronic properties of atomic scale motifs are difficult to measure because of complexity associated to patterning such small electrical probe contacts. In this work, we measure the electrical resistance of an antiphase boundary of a GdAu2 surface alloy. The GdAu2 monolayer is prepared on a Au(111) substrate and is known to be in-plane ferromagnetically ordered at low temperatures. It exhibits occasional antiphase boundaries which separate structurally identical but phase shifted domains by an atomically sharp 1D lattice defect. Here we measure the magnetotransport response across the boundary.
The measurements were performed by means of the recently developed Molecular Nanoprobe (MONA) technique. In this technique charge carriers (electrons or holes) are injected from the tip of a scanning tunneling microscope (STM) and detected by conformational switching processes excited inelastically by hot electrons reaching dehydrogenated phthalocyanine molecules. By statistically analyzing thousands of injection sequences the charge transport between two surface spots can be evaluated.