ELFT HÍRADÓ

[mcsete AT physx.u-szeged.hu]

Seminar

Speaker: Dr. Levente Rózsa
HUN-REN Wigner Research Centre for Physics

Date: 2 pm, 16, April (Wednesday) 2025
Location: University of Szeged, Institute of Physics, Zoltán Bay class-room
& online  https://join.skype.com/u5U6dydk902N

Title: Topology in magnetism on the nanoscale

Abstract:
The orientation of magnetic moments is widely used to encode  
information in data storage devices. The atomic magnetic moments or  
spins align in exotic spin configurations such as domain walls,  
vortices, skyrmions or hopfions in many materials. Despite their  
typical sizes in the nanometer range, these spin configurations are  
often very robust, and their stability is rooted in their topological  
properties. Such topological spin structures have attracted  
considerable research attention recently due to their proposed  
applications in conventional and unconventional computing architectures.
Here, we discuss some recent results on topological spin  
configurations. We investigate the thermal stability of various types  
of magnetic skyrmions based on the magnetic interactions stabilizing  
them [1,2]. Skyrmions may be treated as quasiparticles forming  
thermodynamic phases, where their dynamics is strongly influenced by  
their topological charge [3]. In strongly anisotropic systems, unique  
types of magnetic domain walls may form, which transform into chains  
of skyrmions under applying an external magnetic field [4].

[1] D. Schick, M. Weißenhofer, L. Rózsa, U. Nowak, Phys. Rev. B 103,  
214417 (2021).
[2] B. Nagyfalusi, L. Udvardi, L. Szunyogh, L. Rózsa, Phys. Rev. B  
109, 094418 (2024).
[3] D. Schick, M. Weißenhofer, L. Rózsa, J. Rothörl, P. Virnau, U.  
Nowak, Phys. Rev. Research 6, 013097 (2024).
[4] R. Brüning, L. Rózsa, R. Lo Conte, A. Kubetzka, R. Wiesendanger,  
K. von Bergmann, arXiv:2411.04009 (2024).

Everyone is welcome to attend.
Dr. Mária Csete


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