DPG Phi
Verhandlungen
Verhandlungen
DPG

Dresden 2020 – wissenschaftliches Programm

Die DPG-Frühjahrstagung in Dresden musste abgesagt werden! Lesen Sie mehr ...

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MA: Fachverband Magnetismus

MA 47: Skyrmions IV (joint session MA/TT)

MA 47.7: Vortrag

Donnerstag, 19. März 2020, 11:00–11:15, POT 6

Hopfions in magnetic crystalsFilipp N. Rybakov1, •Nikolai S. Kiselev2, Aleksandr B. Borisov3, Lukas Döring4, Christof Melcher4, and Stefan Blügel21Department of Physics, KTH-Royal Institute of Technology, SE-10691 Stockholm, Sweden — 2Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich & JARA, 52425 Jülich, Germany — 3Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, Ekaterinburg 620990, Russia — 4Department of Mathematics I & JARA FIT, RWTH Aachen University, 52056 Aachen, Germany

Hopfions are three-dimensional topological solitons, which can be thought of as skyrmion tubes with closed ends. In the pioneering work of Bogolyubsky [1], it was shown that in the micromagnetic model with higher-order derivatives of the order parameter, the hopfions might appear as statically stable solutions. Here we show that the general form of such a micromagnetic functional can be derived from classical spin-lattice Hamiltonians with competing Heisenberg exchange interactions. We present this advanced micromagnetic functional derived for lattices of cubic symmetry and provide a criterion for the existence of hopfions in the systems described by such a functional [2]. Following our approach, similar functionals can be derived for materials of any crystal symmetry. We discuss a variety of hopfion solutions, their static and dynamic properties, and provide concrete guidance for the search of magnetic crystals that allow the existence of hopfions.
[1] I. L. Bogolubsky, Phys. Lett. A 126, 511 (1988).
[2] F. N. Rybakov, et al., arXiv:1904.00250.

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2020 > Dresden