Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 36: Poster Session II (Metals; Nanostructures at surfaces; Surface or interface magnetism; Spin-Orbit Interaction at Surfaces; Electron and spin dynamics; Surface dynamics; Methods; Theory and computation of electronic structure)
O 36.90: Poster
Dienstag, 15. März 2011, 18:30–22:00, P4
Depth Resolved Photoelectron Microscopy of Nanostructures via Soft X-Ray Standing Wave Excitation — •Florian Kronast1, Alexander Gray2, Christian Papp3, See-Hun Yang4, Alexander Kaiser4, Farhad Salmassi6, Eric M. Gullikson6, Dawn L. Hilken6, Erik H. Anderson6, Hermann A. Dürr1, Claus M. Schneider5 und Charles S. Fadley2 — 1Helmholtz-Zentrum Berlin - BESSY II, Berlin, Germany — 2Department of Physics, University of California, Davis, CA, USA — 3Physical Chemistry II, University of Erlangen, Germany — 4IBM Almaden Research Center, San Jose, CA, USA — 5Juelich Research Center, Jülich, Germany — 6Center for X-Ray Optics, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
We demonstrate the addition of depth resolution to the usual two-dimensional images in photoelectron emission microscopy (PEEM), with application to a square array of circular magnetic Co microdots. The method is based on excitation with soft x-ray standing-wave (SW) generated by Bragg reflection from a multilayer mirror substrate. The standing wave is moved vertically through the sample simply by varying the photon energy around the Bragg condition. Photoemission intensities as functions of photon energy were compared to x-ray optical theoretical calculations in order to quantitatively derive the depth-resolved film structure of the sample. This SW approach thus provides complementary information to the usual lateral information provided by the PEEM, and should have wide applicability to studies of magnetic nanostructures in the future.