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 59: Posters Magnetism III

MA 59.51: Poster

Freitag, 20. März 2020, 09:00–12:00, P2/EG

Skyrmion lattice formation — •Thomas Winkler, Jakub Zázvorka, Nico Kerber, Klaus Raab, Florian Dittrich, Yuqingh Ge, Peter Virnau, and Mathias Kläui — Johannes Gutenberg Universität Mainz, Staudinger Weg 7, 55128 Mainz

Magnetic skyrmions are highly interesting magnetic spin structures and potential candidates for next generation computing devices due to their topology based stability [1,2]. There has been much work on the individual static and dynamic properties of skyrmions. However, their collective behavior is not yet well explored in particular in multilayer stacks with interfacial DMI. We have stabilized a skyrmion lattice in a single stack of Ta(5)/Co20Fe60B20(0.9)/Ta(0.08)/MgO(2)/Ta(5), and found that statistical order parameters can be varied by a change of the In-plane field and the temperature. The 2d skyrmion ensemble typically forms a liquid phase, but we also observe the emergence of hexagonal order for high densities. Using experimentally obtained parameters, coarse-grained numerical simulations are performed by modelling skyrmions as repulsive soft disks [3] to explain the results.

[1] Finocchio, G., Büttner, F., Tomasello, R., Carpentieri, M. & Kläui, M. Magnetic skyrmions: from fundamental to applications. J. Phys. D. Appl. Phys. 49, 423001 (2016). [2] Fert, A., Reyren, N. & Cros, V. Magnetic skyrmions: advances in physics and potential applications. Nat. Rev. Mater. 2, 17031 (2017). [3] S. Kapfer, S., Krauth, W. Soft-disk melting: From liquid-hexatic coexistence to continuous transitions. Physical Review Letters 114, 035702 (2015)