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MA: Fachverband Magnetismus

MA 13: Micro- and Nanostructured Magnetic Materials

MA 13.2: Talk

Monday, March 18, 2024, 15:15–15:30, EB 407

Three-dimensional magnetic nanotextures — •Oleksii M. Volkov¹, Oleksandr V. Pylypovskyi^1,2, Fabrizio Porrati³, Florian Kronast⁴, Jose A. Fernandez-Roldan¹, Attila Kákay¹, Alexander Kuprava³, Sven Barth³, Filipp N. Rybakov⁵, Olle Eriksson⁵, Sebastian Lamb-Camarena⁶, Pavlo Makushko¹, Mohamad-Assad Mawass⁴, Shahrukh Shakeel¹, Oleksandr V. Dobrovolskiy⁶, Michael Huth³, and Denys Makarov¹ — ¹Helmholtz-Zentrum-Dresden-Rossendorf, Dresden, Germany — ²Kyiv Academic University, Kyiv, Ukraine — ³Johann Wolfgang Goethe-Universität Frankfurt am Main, Frankfurt am Main, Germany — ⁴Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany — ⁵Uppsala University, Uppsala, Sweden — ⁶University of Vienna, Faculty of Physics and Vienna Doctoral School in Physics, Vienna, Austria

Additive nanotechnologies enable curvilinear and three-dimensional (3D) magnetic architectures with tunable topology and functionalities surpassing their planar counterparts. Here, we reveal that 3D soft magnetic wireframe structures resemble compact manifolds and accommodate magnetic textures of high order vorticity determined by the Euler characteristic, χ: (i) self-standing tetrapods, χ=+2, support four vortices and two antivortices, with a total vorticity of +2; (ii) wireframe structures with one loop, χ = 0, possess equal number of vortices and antivortices; (iii) wireframe geometries with N holes, χ = 2(1−N), enable the accommodation of a virtually unlimited number of antivortices.