SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 14: Surface Magnetism
MA 14.4: Vortrag
Dienstag, 28. März 2023, 10:45–11:00, HSZ 04
Conical spin-spirals at a ferromagnet’s surface: experimetal observations — •Patrick Haertl1, Gustav Bihlmayer2, Markus Leisegang1, Stefan Bluegel2, and Matthias Bode1 — 1Universität Würzburg, Germany — 2Forschungszentrum Jülich and JARA, Germany
The spin-orbit–driven Dzyaloshinskii-Moriya interaction (DMI) can lead to chiral spin structures in magnetic systems with broken inversion symmetry [1].
The purely interfacial origin of DMI generally results in a reciprocal scaling with the magnetic layer thickness [2].
Here we report on the observation of a conical spin-spiral state at the surface of epitaxial Gd(0001) films grown on W(110).
In a recently performed spin-polarized scanning tunneling microscopy (SP-STM) investigation
of the thickness-dependent domain structures of Gd/W(110) we confirmed the existence of a spin reorientation transition (SRT) [3] from in-plane to out-of-plane magnetized films at a critical thickness Θcrit≈ (100± 20) AL [4].
In the vicinity of this SRT, we identify striped regions with a periodicity of about 2 nm.
The application of an external magnetic field induces a rearrangement of the stripes,
thereby unambiguously confirming its magnetic origin.
The experimental observations are discussed on the basis of density functional theory (DFT).
[1] T. Moriya, Phys. Rev. 120, 91-98 (1960).
[2] J. Cho et al., Nature Comm. 6, 7635 (2015).
[3] A. Berger et al., Phys. Rev. B 52, 1078 (1995).
[4] P. Härtl et al., Phys. Rev. B 105, 174431 (2022).