Berlin 2024 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 30: Skyrmions II

MA 30.7: Vortrag

Mittwoch, 20. März 2024, 17:00–17:15, EB 301

Reversible topological transformation of skymions and trivial bubbles — •Timo Schmidt¹, Sabri Koraltan², and Manfred Albrecht¹ — ¹Universität Augsburg, Augsburg, Germany — ²Universität Wien, Wien, Austria

Magnetic skyrmions and type-2-bubbles represent topologically distinct spin textures that have garnered significant attention in the field of condensed matter physics due to their unique properties and potential applications in information storage and processing. While these objects can be stabilized in a wide variety of materials by different mechanisms, this work focusses on dipolar stabilized spin textures in amorphous Fe/Gd-multilayer thin films. These systems are sputter-deposited on SiN-membranes.

Using Lorentz transmission electron microscopy (LTEM) round spin textures can be imaged as they nucleate from the stripe domain state by applying a magnetic field in out-of-plane direction. We observe distinct locations on the membrane where certain types of spin objects are stabilized predominantly and attribute this to the wrinkling of the membrane. Due to this wrinkling, which originates in the sample manufacturing process, there are intrinsically tilted regions on the membrane, resulting in an effective in-plane field component. Tilting of the whole sample in the range of up to 18° shows, that by changing the contribution of the ip-field, topologically trivial type-2-bubbles can be transformed into topologically protected skyrmions and vice versa.

Keywords: Ferrimagnetism; Multilayer; LTEM; Skyrmions