Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 110: Surface Magnetism I (joint session O/MA)

O 110.10: Vortrag

Donnerstag, 19. März 2020, 17:15–17:30, WIL A317

Quantifying exchange forces of a spin spiral on the atomic scaleNadine Hauptmann1, Soumyajyoti Haldar2, Tzu-Chao Hung1, •Wouter Jolie1, Lorena Niggli1,3, Mara Gutzeit2, Daniel Wegner1, Stefan Heinze2, and Alexander A. Khajetoorians11Institute for Molecules and Materials, Radboud University, Nijmegen, The Netherlands — 2Institut für Theoretische Physik und Astrophysik, Christian-Albrechts-Universität, Kiel, Germany — 3Physik Institut, University of Zurich, Switzerland

Chiral magnetic structures are stabilized by an interplay between competing exchange interactions at the atomic scale. Spin-polarized scanning tunneling microscopy (SP-STM) has achieved great success in investigating the magnetization of such structures, but faces a number of limitations in being able to directly detect the underlying exchange forces, as well as delineate between structural and electronic contributions. To go beyond these limitations, we have developed a new method, which combines SP-STM and magnetic exchange force microscopy (SPEX) based on nc-AFM. Here, we utilize SPEX to investigate a monolayer of Mn on W(110), which exhibits an antiferromagnetic cycloidal spin-spiral ground state driven by the Dzyaloshinskii-Moriya interaction. We show that our force measurements are more sensitive to atomic-scale variations of the exchange force field and the local chemical environment than the current [1]. First-principles calculations explain our observations and reveal the magnetic exchange force mechanisms.

[1] N. Hauptmann et al., arXiv:1908.00959

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