Observation of the sliding phason mode of the incommensurate magnetic texture in Fe/Ir(111) - Archive ouverte HAL Access content directly
Preprints, Working Papers, ... Year : 2023

Observation of the sliding phason mode of the incommensurate magnetic texture in Fe/Ir(111)

Hung-Hsiang Yang
  • Function : Author
Louise Desplat
Volodymyr P Kravchuk
  • Function : Author
Timofey Balashov
  • Function : Author
Simon Gerber
  • Function : Author
Markus Garst
  • Function : Author
Bertrand Dupé
  • Function : Author
Wulf Wulfhekel
  • Function : Author

Abstract

The nanoscopic magnetic texture forming in a monolayer of iron on the (111) surface of iridium, Fe/Ir(111), is spatially modulated and uniaxially incommensurate with respect to the crystallographic periodicities. 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, which we explicitly confirm with atomistic spin simulations. Using scanning tunneling microscopy (STM), we succeed to observe this phason mode experimentally. It can be excited by the STM tip, which leads 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 our 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.
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Dates and versions

hal-04284402 , version 1 (14-11-2023)

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Hung-Hsiang Yang, Louise Desplat, Volodymyr P Kravchuk, Marie Hervé, Timofey Balashov, et al.. Observation of the sliding phason mode of the incommensurate magnetic texture in Fe/Ir(111). 2023. ⟨hal-04284402⟩
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