SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 14: Surface Magnetism

MA 14.6: Vortrag

Dienstag, 28. März 2023, 11:15–11:30, HSZ 04

Non-collinear spin structure of trilayer Mn films on W(001) — •Tim Drevelow¹, Paula M. Weber², Jing Qi², Matthias Bode^2,3, and Stefan Heinze¹ — ¹Institute of Theoretical Physics and Astrophysics, University of Kiel, Leibnizstraße 15, 24098 Kiel, Germany — ²Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — ³Wilhelm Conrad Röntgen-Center for Complex Material Systems (RCCM), Universität Würzburg, Am Hubland, 97074 Würzburg, Germany

The spin structure of Mn films on the W(001) surface depends sensitively on the number of atomic layers. It has been shown that a Mn monolayer exhibits a spin spiral driven by the Dzyaloshinskii-Moriya interaction (DMI) [1] while the Mn double layer possesses an antiferromagnetic checkerboard state and vanishing Mn moments at the interface [2]. Here, we study the Mn trilayer on W(001) with a combination of spin-polarized scanning tunneling microscopy (SP-STM) and density functional theory (DFT) calculations. Experimentally, it is shown that the Mn films grow pseudomorphically and exhibit a c(4×2) magnetic superstructure consistent with a conical spin spiral ground state. Based on our DFT calculations we compare the total energies of different collinear and non-collinear spin structures including the effect of spin-orbit coupling. We find a complex interplay of magnetic interactions and structural relaxations of the Mn trilayer.

[1] Ferriani et al. Phys. Rev. Lett. 101, 027201 (2008).

[2] Meyer et al. Phys. Rev. Research 2, 012075(R) (2020)