Regensburg 2013 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 35: Magnetic Oxides and Shape Memory Alloys (jointly with MM)

MA 35.4: Vortrag

Donnerstag, 14. März 2013, 10:15–10:30, H23

Magnetic dichroism in angular resolved hard X-ray photoelectron spectroscopy from buried magnetic layers. — •Carlos Eduardo Viol Barbosa, Siham Ouardi, Daniel Ebke, Gerhard H. Fecher, and Claudia Felser — Max Planck Institute for Chemical Physics of Solids

The high bulk sensitivity of hard X-ray photoelectron spectroscopy (HAXPES) in combination with circularly polarized radiation enables the investigation of the magnetic properties of buried layers. Angular distributions of high kinetic energy (7 to 8 keV) photoelectrons in a range of about 60^∘ were recorded in parallel to the energy distribution. Depending on purpose, energy and angular resolutions of 150 to 250 meV and 0.17^∘ to 2^∘ can be accomplished simultaneously in such experiments. Experiments were performed on exchange-biased magnetic layers covered by thin oxide films. More specifically, the angular distribution of photoelectrons from the ferromagnetic layer Co₂FeAl layer grown on MnIr exchange-biasing layer was investigated where the magnetic structure is buried beneath a MgO layer. Pronounced magnetic dichroism is found in the Co and Fe 2p states for all angles of emission. A slightly increased magnetic dichroism was observed for normal emission in agreement with theoretical considerations.