Regensburg 2025 – scientific programme
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MA: Fachverband Magnetismus
MA 31: Poster II
MA 31.43: Poster
Wednesday, March 19, 2025, 17:00–19:30, P1
Magnetometry of Buried Co-based Nanolayers by Hard X-ray Photoelectron Spectroscopy — •Andrei Gloskovskii1, Christoph Schlueter1, and Gerhard Fecher2 — 1Photon Science / DESY, Hamburg — 2Max Planck Institute for Chemical Physics of Solids, Dresden
Magnetic circular dichroism (MCD) effect has a cos (θ) dependence where θ is the angle between light polarization and sample magnetization. This yields direct information about the magnetization direction with respect to the polarization of the synchrotron X-ray beam for both ferromagnetic and antiferromagnetic materials. In the hard X-ray regime, the beam polarization can be conveniently modified utilizing the phase shift produced by a diamond phase plate in the vicinity of a Laue or Bragg reflection. Extracting quantitative information about absolute values of local magnetic moments is very challenging, because of the complicated structure of photoelectron spectra. For example, the 4eV Co satellite cannot be explained by the solid-state calculations. The satellite obviously exhibits strong dichroism.
The electronic and magnetic properties of CoFe, CoFeB and Co-based Heusler nanolayers were studied using MCD. Both the polarization-dependent spectra and the dichroism indicate that the lines of the multiplet extend over the entire spectral range. It is demonstrated that MCD in HAXPES is an effective and powerful technique to perform element- and depth-specific magnetometry of deeply buried ferromagnetic and antiferromagnetic magnetic materials.
Keywords: CoFe; HAXPES; XPS; MCD