ELFT HÍRADÓ

[Janos Asboth <asboth.janos AT wigner.mta.hu>]

Noncollinear spin configurations in ultrathin magnetic films

*Rózsa Levente*
MTA Wigner FK SZFI

2017. szeptember. 19., kedd, 10.00, MTA Wigner FK SZFI, I. épület 1.
emeleti Tanácsterem

Noncollinear spin configurations such as chiral domain walls, spin spirals
and magnetic skyrmions play an essential role in spintronics applications,
providing promising prospects for the development of future high-speed
memory and logic devices. Recently the most widely investigated mechanism
in this field is the Dzyaloshinsky-Moriya interaction, appearing due to the
presence of inversion symmetry breaking at surfaces and interfaces and the
strong spin-orbit coupling from heavy metal substrates. Using ab initio
calculations and classical spin model simulations, we demonstrate how the
presence of frustrated Heisenberg exchange interaction interplays with the
Dzyaloshinsky-Moriya interaction, changing the interaction potential
landscape for isolated skyrmions [1] and stabilizing localized
configurations with different topological charges [2]. We also show an
example of how interaction parameters resolved within atomic layers can
explain a significant modulation of the magnetic period length in ultrathin
films, recently investigated in three-atomic-layer-thick Fe films grown on
Ir(111) surface using spin-polarized scanning tunneling microscopy
experiments [3].


[1] L. Rózsa, A. Deák, E. Simon, R. Yanes, L. Udvardi, L. Szunyogh, and U.
Nowak, Phys. Rev. Lett. 117, 157205 (2016)
[2] L. Rózsa, K. Palotás, A. Deák, E. Simon, R. Yanes, L. Udvardi, L.
Szunyogh, and U. Nowak, Phys. Rev. B 95, 094423 (2017)
[3] A. Finco, L. Rózsa, P.-J. Hsu, A. Kubetzka, E. Vedmedenko, K. von
Bergmann, and R. Wiesendanger, Phys. Rev. Lett. 119, 037202 (2017)



Minden érdeklődőt szívesen látunk!

Asbóth János
szfi-seminar AT wigner.mta.hu