Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 54: Spin Hall Effects and Skyrmions II
MA 54.10: Vortrag
Donnerstag, 23. März 2017, 17:30–17:45, HSZ 04
Magnetic and chiral properties of epitaxial Pt/Con/Ir(111) films investigated by SP-STM — •Marco Perini, André Kubetzka, Kirsten von Bergmann, and Roland Wiesendanger — Department of Physics, University of Hamburg, D-20355 Hamburg, Germany
Magnetic skyrmions are promising candidates for future spintronics technology. They have been recently observed at room temperature with different techniques in cobalt-based multilayered thin films [1,2]. The cobalt layer is placed between two heavy metals to provide a strong interfacial Dzyaloshinskii-Moriya interaction (iDMI). However, the details of the spin structure in these films remain elusive due to the limited spatial resolution of the applied techniques.
In this work we performed low-temperature spin-polarized scanning tunneling microscopy (SP-STM) on epitaxially grown Co/Ir(111) and Pt/Co/Ir(111) ultrathin films. We observe large-scale magnetic domains, on the order of hundreds of nanometers, separated by sharp domain walls, only a few nanometers wide. We show that these walls possess a unique rotational sense, a sign of a strong DMI at the Co/Ir interface, which produces Néel-type domain walls. In addition, measuring the domain wall width as a function of Co and Pt thickness provides information on the magnetic parameters of these systems, such as A, K and D.
[1] Moreau-Luchaire et al., Nat. Nano. 11, 444-448 (2016),
[2] Boulle et al., Nat. Nano. 11, 449-454 (2016)