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O: Fachverband Oberflächenphysik
O 28: Poster Session - Scanning Probe techniques: Method Development
O 28.6: Poster
Montag, 16. März 2020, 18:15–20:00, P1A
Atom manipulation capabilities of MnNi Tips in STM — •Nicolaj Betz1, Max Hanze1,2, Luigi Malavolty1,2, Fabian D. Natterer3, Susanne Baumann1, and Sebastian Loth1,2 — 1University of Stuttgart, Institute for Functional Matter and Quantum Technologies, Stuttgart, Germany — 2Max Planck Institute for Solid State Research, Stuttgart, Germany. — 3University of Zurich, CH-8057 Zurich, Switzerland.
Scanning tunneling microscopy (STM) with spin-polarized tips can combine the ability to manipulate individual atoms with the ability to gain fundamental insights into magnetic interactions via the spin-sensitivity in the current [1]. In this work, we investigate the performance and the manipulation capabilities of antiferromagnetic MnNi tips. Antiferromagnetic tips are promising candidates for spin-polarized STM because of their robust microscopic magnetization, that defines spin contrast, and their small stray field, which reduces perturbations on the probed magnetic structures. We etch our tips using a HCl solution [2] and characterize them with scanning electron microscopy. The tips require intense in-vacuum cleaning. We find that self-sputtering using field emission in an Ar atmosphere yields clean and sharp tips. We perform STM measurements at different magnetic fields on Cobalt islands evaporated on Au(111). And we investigate the atom manipulation capabilities by dropping individual atoms from the tip.
[1] Toskovic, R. et al., Nature Phys 12, 656-660 (2016)
[4] Forrester et al., Rev. Sci. Instrum. 89, 123706 (2018)