Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 41: Surface magnetism I
MA 41.11: Vortrag
Donnerstag, 15. März 2018, 12:15–12:30, EB 202
Tunneling anisotropic magnetoresistance via molecular π orbitals of Pb dimers — Johannes Schöneberg1, Paolo Ferriani2, •Stefan Heinze2, Alexander Weismann1, and Richard Berndt1 — 1Institute of Experimental Physics, Christian-Albrechts-Universität zu Kiel, Germany — 2Institute of Theoretical Physics and Astrophysics, Christian-Albrechts-Universität zu Kiel, Germany
Tunneling anisotropic magnetoresistance (TAMR) [1,2] has been observed down to the single atom limit [3].
However, so far mostly 3d transition-metals with a considerable magnetic moment have been studied. Here, we demonstrate a large TAMR for individual Pb dimers
on a ferromagnetic surface due to molecular π orbitals.
Dimers oriented differently with respect to the magnetization directions of a ferromagnetic Fe double layer on W(110) were made with a scanning tunneling microscope.
Depending on the dimer orientations, TAMR is absent or as large as 20% at the Fermi level.
General arguments and first-principles calculations show that mixing of molecular orbitals due to spin-orbit coupling, which leads to TAMR, is maximal when the magnetization is oriented parallel to the dimer axis.
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