Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 20: Poster I
MA 20.42: Poster
Dienstag, 19. März 2024, 16:30–19:00, Poster A
Imprinting Magnetic Textures By Geometrical Transformation — •Aman Singh1,2, Balram Singh1,2, Yana Vaynzof1,2, and Volker Neu1 — 1Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, 01069 Dresden, Germany — 2Technische Universität Dresden, 01062 Dresden, Germany
The application of magnetic devices largely depends on magnetization patterns and the type and quality of domain walls so control over them is an important step in developing magnetic material systems/devices. We present a simple technique to create different types of magnetization patterns, e.g. alternate out-of-plane up-down domains and in-plane head-to-head and tail-to-tail configurations, by a self-assembled geometrical transformation. This is achieved with the help of a polymer platform which consists of a hydrogel as a swelling layer and a stiff polyimide layer. Upon swelling and un-swelling, the platform transforms reversibly into a multi-winding tube. Depending upon the anisotropy of the magnetic material, regular domain patterns can be created simply by applying a homogeneous magnetic field to the magnetic thin films in the rolled state and then unrolling it. The regular domain patterns imprinted by geometrical transformation (GTMP) are thoroughly characterized by Kerr and magnetic force microscopy, and the corresponding stray field landscape is compared with calculations. By going through the intermediate rolled sample state, this technique also offers the possibility to investigate magnetization processes in 3 dimensions.
Keywords: Domains; Domain walls; Rolled-up nanotechnology; Magnetic anisotropy; Spin configuration