Dresden 2011 – scientific programme
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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 36.109: Poster
Tuesday, March 15, 2011, 18:30–22:00, P4
Development of a thin film spin filter optics for PEEM — •Daniel Panzer1,2, Jan David Kuttig1, and Gerd Schönhense1 — 1Institut für Physik, Johannes-Gutenberg Universität Mainz — 2Max-Planck Institut für Polymerforschung, Mainz
Analyzing the spin polarization of electrons is a vital aspect of many experiments in nuclear, molecular, surface and solid-state physics, and of fundamental importance for investigations of ferromagnetic materials. However, combining spin detection with a laterally resolved method like PhotoEmission Electron Microscopy (PEEM) is quite demanding. One possibility is the use of low energy electron diffraction for spinfiltering of an image or a momentum distribution [1].
Here we test a new method that takes advantage of the spin dependence of the mean free path of electrons in magnetized ferromagnet. We use a tandem lens to extract electrons from a sample and project the magnified electron image onto a thin metal film that acts as a spin filter at low kinetic energies. On the opposite side the spinfiltered image is then picked up and further magnified by a regular PEEM optics.
We have successfully tested the electron optics at low magnification with a calibration sample and confirmed transmission through nm-thick layers of metals and semiconductors with a thermal emitter as electron source. The next challenge is combining photoemission, electron optics and transmission in a way that provides sufficient intensity so PEEM images can be aquired fast enough for regular use.
Funded by DFG(SCHO341/7-1); [1] Tusche et al., this conference