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PGI-1 Talk: Dr. Levente Rozsa

Atomistic spin models from the relativistic screened Korringa-Kohn-Rostoker method

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20 Jul 2016 11:30
venue
PGI Lecture Hall

Wigner Research Centre for Physics, Hungarian Academy of Sciences

Abstract:

Atomistic spin models represent a successful method for the description of noncollinear magnetic structures in ultrathin films, including domain walls, spin spirals and skyrmions. Due to the promising applications of these spin structures in future magnetic logic and data storage devices, it is desirable to study how the model parameters can be determined based on ab initio electronic structure calculations, which may provide an insight into material-specific characteristics. In the presence of strong spin-orbit coupling in heavy elements, the interaction between localized spins cannot be sufficiently described by a simple Heisenberg model, but it must be expanded by further terms such as on-site and two-site anisotropies, as well as the Dzyaloshinsky-Moriya interaction.
In this talk, I will introduce how such a spin model may be constructed within the terms of the relativistic screened Korringa-Kohn-Rostoker method. By using a Hamiltonian containing tensorial coupling between spins at two different sites, it is possible to include several different interaction terms in the calculations. I will investigate the role of these interactions on the spin structure of domain walls, spin spirals and skyrmions, by applying spin dynamics calculations.

Contact

Prof. Dr. Stefan Blügel
Phone: +49 2461 61-4249
Fax: +49 2461 61-2850
email: s.bluegel@fz-juelich.de