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Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 41: Surface magnetism I

MA 41.6: Vortrag

Donnerstag, 15. März 2018, 10:45–11:00, EB 202

Step Edge Induced Anisotropic Chiral Spin Coupling Observed in Ultrathin Magnetic Films — •Stefan Krause, Anika Schlenhoff, and Roland Wiesendanger — Department of Physics, University of Hamburg, Germany

Breaking the symmetry at planar interfaces and surfaces results in a chiral spin coupling due to Dzyaloshinskii-Moriya interactions (DMI), driven by spin-orbit coupling. DMI stabilize an inhomogeneous right-rotating cycloidal spin spiral ground state in the Fe double layer (DL) on W(110), as has been demonstrated by means of spin-polarized scanning tunneling microscopy (SP-STM) [1]. In contrast, the Fe monolayer (ML) on W(110) is found to be ferromagnetic [2].

An atomic step edge separating DL and ML areas of coverage results in a breaking of the lateral symmetry of the film, potentially giving rise to localized additional DMI. In our SP-STM experiments we investigate the spin configurations around Fe/W(110) ML/DL step edges. The data give clear indications for a chiral spin coupling of the DL to the ML. Depending on the step edge orientation, the DL spin texture is locally affected by a deformation of the spin spiral and selection rules for the formation of 90 domain walls. Interestingly, an inversion of the spin coupling chirality is found for step edges oriented along the [001] and close-packed crystallographic directions, respectively. The SP-STM data will be presented and discussed in terms of anisotropic chiral spin coupling of the DL to the ML.

[1] S. Meckler et al., Phys. Rev. Lett. 103, 157201 (2001).

[2] M. Pratzer et al., Phys. Rev. Lett. 87, 127201 (2001).

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