Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 55: Thin Films: Magnetic Anisotropy
MA 55.11: Vortrag
Donnerstag, 23. März 2017, 17:45–18:00, HSZ 101
Domain wall profiles in Co/Irn/Pt(111) ultrathin films — György J. Vida1, Eszter Simon1, •Levente Rózsa2, Krisztián Palotás3, and László Szunyogh1 — 1Budapest University of Technology and Economics, Budapest, Hungary — 2Wigner Research Centre for Physics, Hungarian Academy of Sciences, Budapest, Hungary — 3Institute of Physics, Slovak Academy of Sciences, Bratislava, Slovakia
Motivated by recent experiments [1,2] we present a study of domain walls in Co/Irn/Pt(111) (n=0,…,6) films by a combined approach of first-principles calculations and spin dynamics simulations. We calculate the tensorial exchange interactions and the magnetic anisotropies for the Co overlayer and find strong out-of-plane magnetic anisotropy for the films with FCC geometry. We demonstrate that the rotational sense (chirality) of domain walls is changed upon the insertion of an Ir buffer layer as compared to the pristine Co/Pt(111) system, unambigously associated with the orientation of the in-plane components of the Dzyaloshinskii-Moriya (DM) vectors. Our simulations also indicate a twisting of the spins with respect to the planar domain wall profile on the triangular lattice. We discuss this domain wall twisting using symmetry arguments and by using an appropriate micromagnetic continuum model considering energy terms related to the out-of-plane component of the DM interaction as well as to specific symmetric off-diagonal elements of the exchange tensor. [3]
[1] G. Chen et al., Nat. Comm. 4, 2671 (2013)
[2] A. Hrabec et al., Phys. Rev. B 90, 020402 (2014)
[3] Gy. J. Vida et al., arXiv:1611.09518 (2016)