Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 37: Skyrmions II (joint session MA/TT/KFM)

TT 37.1: Vortrag

Dienstag, 13. März 2018, 09:30–09:45, EB 301

Low temperature magnetic field mapping on Néel-skyrmions in GaV4Se8 — •Franziska Seifert¹, Felix L. Kern¹, István Kézsmárki², Daniel Wolf¹, Bernd Büchner¹, and Axel Lubk¹ — ¹Leibniz Institute for Solid State and Materials research Dresden, Germany — ²University of Augsburg, Germany

Skyrmions are promising candidates for magnetic memory devices, because of their small size, thermal stability and high mobility. Here we report on Skyrmion mapping in GaV4Se8 carried out on our dedicated cryo TEM fitted with a continuous-flow liquid He cryostat, facilitating electron holography and Lorentz TEM down to 7K. Bulk GaV4Se8 is predicted to show Neel type skyrmions below 18K under applied magnetic field between 0.10T and 0.45T mT. Using Lorentz TEM, we characterized the cycloidal and skyrmionic phase of thin GaV4Se8 lamellas in dependence of temperature and applied magnetic field. By mapping the magnetic phase diagram of the thin film we identify magnetic textures that are not considered in the bulk phase diagram. We discuss the origins of these in terms of crystal symmetries and strain prevailing in the thin film slab geometry.