Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 11: Magnetic Materials

MA 11.13: Vortrag

Montag, 23. März 2009, 18:30–18:45, HSZ 103

Investigations on the MTJ interface Co₂MnSi-MgO using electron spectroscopy with x-ray standing wave excitation. — •Benjamin Balke¹, Christian Papp¹, Catherine A. Jenkins², Gerhard H. Fecher², Charles S. Fadley¹, and Claudia Felser² — ¹Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA — ²Institute of Inorganic and Analytical Chemistry, Johannes Gutenberg - University, Mainz, Germany

We have used x-ray standing wave excitation of photoelectrons to study buried layers and interfaces in multilayer nanostructures. In particular, measurements carried out at the ALS with 1.2 keV photon energy will be emphasized. The samples were grown on synthetic multilayer mirrors and the x-ray incidence angle was tuned to the 1st order Bragg reflection. Scanning angle, photon energy, or distance along a wedge profile in the sample permits scanning the resultant standing wave field through nm-scale structures and analyzing the depth distribution of their structural, chemical, electronic, and magnetic properties. In this study we investigated the interface between the Heusler compound Co₂MnSi and MgO as used in MTJs. Therefore we used a wedge of Co₂MnSi with a MgO top layer and used photoelectron spectroscopy with X-ray standing wave excitations. B.B. and C.P. gratefully acknowledge the Feodor Lynen Fellowship by the Humboldt Foundation. Additionally, the authors gratefully acknowledge financial support by the DfG (Research Unit 559).