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MA: Fachverband Magnetismus

MA 46: Surface Magnetism

MA 46.6: Vortrag

Freitag, 21. März 2025, 10:45–11:00, H19

Observation of the sliding phason mode of the incommensurate magnetic texture in Fe/Ir(111) — •Wulf Wulfhekel¹, Hung-Hsiang Yang¹, Louise Desplat², Volodymyr Kravchuk¹, Marie Hervé¹, Timofey Balashov¹, Simon Gerber¹, Markus Garst¹, and Bertrand Dupé² — ¹Karlsruhe Institute of Technology — ²Université de Liège

The nanoscopic magnetic texture forming in a monolayer Fe/Ir(111) is uniaxially incommensurate with respect to the Ir(111) substrate. As a consequence, a low-energy magnetic excitation is expected that corresponds to the sliding of the texture along the incommensurate direction, i.e., a phason mode, that we confirm with atomistic spin simulations. Using Sp-STM, we observed this phason mode experimentally. It can be excited by the STM tip leading to a random telegraph noise in the tunneling current that we attribute to the presence of two minima in the phason potential due to the presence of disorder in the sample. This provides the prospect of a floating phase in cleaner samples and, potentially, a commensurate-incommensurate transition as a function of external control parameters.

Keywords: Non-collinear spin textures; Phason; incommensurate structures