Volume 104, Number 1, October 2013
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||23 October 2013|
Momentum-resolved electronic structure at a buried interface from soft X-ray standing-wave angle-resolved photoemission
1 Department of Physics, University of California Davis - Davis, CA 95616, USA
2 Materials Sciences Division, Lawrence Berkeley National Laboratory - Berkeley, CA 94720, USA
3 Stanford Institute for Materials and Energy Science, Stanford University and SLAC National Accelerator Laboratory 2575 Sand Hill Road, Menlo Park, CA 94029, USA
4 Department of Chemistry, Physical Chemistry Institute, Ludwig-Maximilians University-Munich - Münich, Germany
5 Peter-Grünberg-Institut PGI-6, Forschungszentrum Jülich GmbH - 52425 Jülich, Germany
6 Faculty of Science and Technology, MESA + Institute for Nanotechnology, University of Twente - Enschede, The Netherlands
7 Advanced Light Source, Lawrence Berkeley National Laboratory - Berkeley, CA 94720, USA
8 IBM Almaden Research Center - San Jose, CA 95120, USA
9 Max-Planck-Institut für Mikrostrukturphysik - Weinberg 2, D-06120 Halle (Saale), Germany
10 National Center for Electron Microscopy, Lawrence Berkeley National Laboratory - Berkeley, CA 94720, USA
11 Department of Earth and Environmental Sciences and Center of Nanoscience (CENS), Ludwig-Maximilians University-Munich - Münich, Germany
Received: 12 September 2013
Accepted: 4 October 2013
Angle-resolved photoemission spectroscopy (ARPES) is a powerful technique for the study of electronic structure, but it lacks a direct ability to study buried interfaces between two materials. We address this limitation by combining ARPES with soft X-ray standing-wave (SW) excitation (SWARPES), in which the SW profile is scanned through the depth of the sample. We have studied the buried interface in a prototypical magnetic tunnel junction La0.7Sr0.3MnO3/SrTiO3. Depth-and momentum-resolved maps of Mn 3d eg and t2g states from the central, bulk-like and interface-like regions of La0.7Sr0.3MnO3 exhibit distinctly different behavior consistent with a change in the Mn bonding at the interface. We compare the experimental results to state-of-the-art density-functional and one-step photoemission theory, with encouraging agreement that suggests wide future applications of this technique.
PACS: 79.60.Jv – Interfaces; heterostructures; nanostructures / 68.49.Uv – X-ray standing waves / 85.75.Dd – Magnetic memory using magnetic tunnel junctions
© EPLA, 2013
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