Dresden 2020 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 15: Computational Magnetism II

MA 15.4: Vortrag

Montag, 16. März 2020, 15:45–16:00, HSZ 403

Magnetically controlled shapes of flexible ferromagnetic ribbons — •Kostiantyn V. Yershov1,2, Volodymyr P. Kravchuk2,3, Denis D. Sheka4, and Jeroen van den Brink11Leibniz Institute for Solid State and Materials Research, Dresden, Germany — 2Bogolyubov Institute for Theoretical Physics, Kyiv, Ukraine — 3Karlsruhe Institute of Technology, Karlsruhe, Germany — 4Taras Shevchenko National University of Kyiv, Ukraine

We consider flexible one- and two-dimensional ferromagnets with coupled magnetic and mechanical subsystems. The coupling between the magnetic and mechanical subsystems is driven by uniaxial anisotropy with the easy-axis normal or tangential to the magnetic film/ring and by the Dzyaloshinskii–Moriya interaction (DMI). We show that magnetic subsystem can determine the equilibrium shape of the ferromagnet. For elastic rings depending on the magnetic and elastic parameters and the size of the system one can obtain two different states: the onion state with the quasi-uniform magnetization and the vortex state with the magnetization oriented tangentially to the wire. We also show that the presence of DMI, results in a spontaneous deformation of a flexible magnetic ribbon. The final state of the ribbon is characterizing by the geometrical chirality whose sign is determined by the sign of the DMI constant. Depending on the mechanical, magnetic, and geometric parameters of the system one can obtain two different states: twisted-state with a straight central line and DNA-like state with a helix-shaped central line.

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