Regensburg 2013 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
MA: Fachverband Magnetismus
MA 35: Magnetic Oxides and Shape Memory Alloys (jointly with MM)
MA 35.4: Talk
Thursday, March 14, 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.