Regensburg 2019 – wissenschaftliches Programm
O 81.2: Hauptvortrag
Donnerstag, 4. April 2019, 11:00–11:30, H24
Directly measuring the anisotropic magnetic exchange force field of a spin spiral — •Nadine Hauptmann1, Tzu-Chao Hung1, Wouter Jolie1, Soumyajyoti Haldar2, Daniel Wegner1, Stefan Heinze2, and Alexander A. Khajetoorians1 — 1Institute for Molecules and Materials, Radboud University, 6525 AJ Nijmegen, Netherlands — 2Institut für Theoretische Physik und Astrophysik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany
Chiral magnets, e.g. magnetic skyrmions and spin spirals, are hot candidates for nano-scale magnetic storage. These 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 delineate between structural and electronic contributions to the spin-polarized density of states. 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 utilizing a tuning fork design. The method has been successfully applied to independently determine the structural corrugation from the electronic and magnetic contributions for single and bi-layers of Fe/Ir(111). Here, we investigate a new regime for SPEX, namely characterize the distance-dependent spectroscopy of the noncollinear magnetic exchange force derived from the antiferromagnetic spin spiral in a monolayer Mn/W(110).