Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 7: Electronic Structure of Surfaces: Magnetism and Spin Phenomena
O 7.8: Vortrag
Montag, 20. März 2017, 12:15–12:30, WIL C107
Spin-spirals in bottom-up fabricated Fe chains induced by Dzyaloshinskii-Moriya interaction — •Manuel Steinbrecher1, Khai Ton That1, Jan Hermenau1, Alexander Ako Khajetoorians2, Jens Wiebe1, and Roland Wiesendanger1 — 1Department of Physics, Hamburg University, 20355 Hamburg, Germany — 2IMM, Radboud University, 6525 AJ Nijmegen, The Netherlands
Magnetic atoms adsorbed on the surface of strong spin-orbit coupling materials experience indirect Dzyaloshinskii-Moriya interaction (DMI) [1]. DMI is an exchange interaction responsible for the stabilization of spin-spirals or Skyrmions by favoring perpendicular orientation of neighboring spins. By depositing single magnetic atoms on a surface and using the tip of a scanning tunneling microscope as a tool, those atoms can be moved to build bottom-up fabricated nanostructures [2]. Spin-sensitive measurements of such bottom-up fabricated chains enable the observation of the spin-state of each atom within the chain. So far, only collinear ferromagnetic [3] or antiferromagnetic [4] ground states have been observed. Here, we were able to measure DMI induced non-collinear ground states on chains of Fe atoms on Pt(111) of different lengths. By fixing the magnetization of the outermost atom in a 16 atoms long chain, we were able to stabilize a spin-spiral and investigate its properties by spin-polarized tunneling spectroscopy. [1] Khajetoorians et al., Nat. Commun. 7, 10620 (2016), [2] Khajetoorians et al., Nat. Phys. 8, 497 (2012); [3] A. Spinelli et al., Nat. Mat. 13, 782 (2014); [4] Khajetoorians et al. Science 332, 1062 (2011).