no code implementations • 16 Feb 2024 • Qichen Xu, Zhuanglin Shen, Alexander Edström, I. P. Miranda, Zhiwei Lu, Anders Bergman, Danny Thonig, Wanjian Yin, Olle Eriksson, Anna Delin
Despite extensive research on magnetic skyrmions and antiskyrmions, a significant challenge remains in crafting nontrivial high-order skyrmionic textures with varying, or even tailor-made, topologies.
no code implementations • 6 Mar 2023 • Qichen Xu, I. P. Miranda, Manuel Pereiro, Filipp N. Rybakov, Danny Thonig, Erik Sjöqvist, Pavel Bessarab, Anders Bergman, Olle Eriksson, Pawel Herman, Anna Delin
To demonstrate how this method works, we identify and analyze spin textures with topological charge $Q$ ranging from 1 to $-13$ (where antiskyrmions have $Q<0$) in the Pd/Fe/Ir(111) system, which we model using a classical atomistic spin Hamiltonian based on parameters computed from density functional theory.
1 code implementation • 31 Dec 2022 • Qichen Xu, Zhuanglin Shen, Manuel Pereiro, Pawel Herman, Olle Eriksson, Anna Delin
A long-standing and difficult problem in, e. g., condensed matter physics is how to find the ground state of a complex many-body system where the potential energy surface has a large number of local minima.
no code implementations • 8 Mar 2021 • Simon Streib, Attila Szilva, Vladislav Borisov, Manuel Pereiro, Anders Bergman, Erik Sjöqvist, Anna Delin, Mikhail I. Katsnelson, Olle Eriksson, Danny Thonig
We consider the mapping of tight-binding electronic structure theory to a local spin Hamiltonian, based on the adiabatic approximation for spin degrees of freedom in itinerant-electron systems.
Materials Science Strongly Correlated Electrons
no code implementations • 26 Jan 2021 • Alena Vishina, Daniel Hedlund, Vitalii Shtender, Erna K. Delczeg-Czirjak, Simon R. Larsen, Olga Yu. Vekilova, Shuo Huang, Levente Vitos, Peter Svedlindh, Martin Sahlberg, Olle Eriksson, Heike C. Herper
From magnetization measurements a saturation polarization of 0. 86 T at 10 K was detected, together with a uniaxial magnetocrystalline anisotropy constant of 1. 18 MJ/m$^3$, and the Curie temperature of $T_{\rm C}$ = 359 K. These magnetic properties make Co$_3$Mn$_2$Ge a very promising material as a rare-earth free permanent magnet, and since we can demonstrate that magnetism depends critically on the amount of disorder of the Co and Ge atoms, a further improvement of the magnetism is possible.
Materials Science
no code implementations • 10 Dec 2020 • Filipp N. Rybakov, Anastasiia Pervishko, Olle Eriksson, Egor Babaev
Here by combining a symmetry-based analysis with numerical computations we predict a new kind of magnetic ordering - antichiral ferromagnetism.
Strongly Correlated Electrons
