SKM 2021 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 5: Posters Magnetism II

MA 5.18: Poster

Dienstag, 28. September 2021, 10:00–13:00, P

Ab initio exploration of hopfion hosting magnets — •Imara Lima Fernandes, Roman Kováčik, and Stefan Blügel — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich & JARA, D-52425 Jülich, Germany

Topological magnetic textures are currently of great interest in condensed matter physics due to their rich science and potential applications in information technology. In contrast to two-dimensional magnetic skyrmions, which are currently under intense scrutiny both theoretically and experimentally, their three-dimensional (3D) counterpart, known as Hopfions, were only recently observed experimentally [1]. Hopfions are stable solutions of the magnetization field with a knotted topological structure. In particular, their simplest spin texture can be described as a closed torus with a topologically nontrivial spin texture in the cross-section profile.

In the current work, using ab initio calculations, we explore suitable classes of materials to host magnetic hopfions based on analytical conditions of Heisenberg exchange parameters derived in Ref. [2]. We address systematically the case of chemical disorder and temperature in order to approach the optimal magnetic parameter field. The present study may give a guidance to identify suitable materials.
– Funding is provided by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant 856538 – 3D MAGiC).

[1] Kent, N. et al, Nat. Commun. 12, 1562 (2021).

[2] Rybakov, F. N. et al, arXiv:1904.00250