Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 3: Focus Session: Novel 3D magnetic spin textures

MA 3.8: Vortrag

Montag, 1. April 2019, 12:45–13:00, H38

Mesoscale Dzyaloshinskii-Moriya interaction: geometrical tailoring of the magnetochirality — •Oleksii Volkov1, Denis Sheka2, Yuri Gaididei3, Volodymyr Kravchuk3,4, Ulrich Rößler4, Jürgen Fassbender1, and Denys Makarov11Helmholtz-Zentrum Dresden-Rossendorf e.V., Dresden, Germany — 2Taras Shevchenko National University of Kyiv, Kyiv, Ukraine — 3Bogolyubov Institute for Theoretical Physics of the National Academy of Sciences of Ukraine, Kyiv, Ukraine — 4Leibniz-Institut für Festkörper- und Werkstoffforschung (IFW Dresden), Dresden, Germany

Magnetic crystals with broken chiral symmetry possess intrinsic spin-orbit driven Dzyaloshinskii-Moriya interaction (DMI). Geometrically broken symmetry in curvilinear magnetic systems also leads to the appearance of extrinsic to the crystal exchange driven effective DMI [1,2]. The interplay between the intrinsic and geometrical-induced DMI paves the way to a mesoscale DMI, whose symmetry and strength depend on the geometrical and material parameters [3]. We demonstrate this approach on the example of a helix with intrinsic DMI. Adjusting the helical geometry allows to create new artificial chiral nanostructures with defined properties from standard magnetic materials. For instance, we propose a novel approach towards artificial magnetoelectric materials, whose state is controlled by means of the geometry.

[1] Y. Gaididei et. al, Phys. Rev. Lett. 112, 257203 (2014).

[2] R. Streubel et. al, J. Phys. D: Applied Physics 49, 363001 (2016).

[3] O. Volkov et. al, Scientific Reports 8, 866 (2018).

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