%0 Conference Paper
%A Bihlmayer, Gustav
%A Härtl, Patrik
%A Leisegang, Markus
%A Bode, Matthias
%A Blügel, Stefan
%T Conical spin-spirals at a ferromagnet’s surface: a theoretical analysis
%M FZJ-2024-00448
%D 2023
%X The properties of surface layers of a magnetic material can differ substantially from those of the bulk material.  A prominent example is the Dzyaloshinskii-Moriya interaction (DMI), resulting from inversion-symmetry breaking at the surface, but also the magnetic anisotropy and the exchange interactions are locally modified.  Gd(0001) is here a well-investigated model surface but despite its sensitivity of exchange interactions, experimental data indicated that it behaves as homogeneous Heisenberg system [1].  Recent observations of spin-spirals  at the surface of epitaxial Gd(0001) with spin-polarized scanning tunneling microscopy let us re-investigate this system. Density functional theory (DFT) calculations show that not only a sizable DMI can be found at the Gd(0001) surface but also the exchange interactions are modified to drive the system locally into a conical spin-spiral state. Since the magnetic anisotropy and the exchange interactions with the ferromagnetic bulk material disfavor non-collinear magnetic states, only slight modifications of the exchange interactions make these spirals visible. We explore the phase diagram numerically and with the help of atomistic spin-dynamics simulations.[1] C. S. Arnold and D. P. Pappas, Phys. Rev. Lett. 85, 5202 (2000)
%B Frühjahrstagung der DPG (SKM)
%C 27 Mar 2023 - 31 Mar 2023, Dresden (Germany)
Y2 27 Mar 2023 - 31 Mar 2023
M2 Dresden, Germany
%F PUB:(DE-HGF)6
%9 Conference Presentation
%U https://juser.fz-juelich.de/record/1020988