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MA: Fachverband Magnetismus
MA 39: Poster Magnetism II
MA 39.9: Poster
Mittwoch, 11. März 2026, 18:00–21:00, P2
Element- and Depth-Selective Magnetometry of Buried Magnetic Layers by MCD-HAXPES at PETRA III — •Andrei Gloskovskii1, Christoph Schlueter1, and Gerhard Fecher2 — 1Photon Science / DESY, Hamburg — 2Max Planck Institute for Chemical Physics of Solids, Dresden
Magnetic circular dichroism (MCD) in hard X-ray photoelectron spectroscopy (HAXPES) provides direct element-specific access to magnetization in deeply buried layers. The MCD signal follows a simple cos(θ) dependence on the angle between the X-ray polarization vector and the sample magnetization. Depth-selective magnetic sensitivity is achieved by exploiting near-total-reflection and waveguide excitation geometries, where the depth resolution is controlled by shaping the spatial intensity profile of the incident hard X-ray field inside the multilayer structure. In both cases, the probing depth is tuned by redistributing the X-ray excitation field inside the sample rather than by changing the emission angle or the kinetic energy of the photoelectrons. Using Co-based alloys as model systems, we show that MCD-HAXPES provides element- and depth-resolved magnetic contrast in complex multilayer stacks. The method is particularly powerful for disentangling interface and bulk magnetization in buried heterostructures. In addition to the methodological aspects, this contribution also presents an overview of recent user activities at beamline P22 (PETRA III), where an increasing number of external user groups have successfully applied MCD-HAXPES for depth-resolved magnetic studies and have already published a broad range of high-impact results.
Keywords: CoFe; HAXPES; XPS; MCD