SKM 2023 – scientific programme
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O: Fachverband Oberflächenphysik
O 51: Surface Magnetism
O 51.6: Talk
Wednesday, March 29, 2023, 12:45–13:00, REC C 213
Utilizing symmetry for magnetic domain imaging via PEEM — •Frank O. Schumann1, Jürgen Henk2, Maximilian Paleschke2, Cheng-Tien Chiang3, and Wolf Widdra2 — 1Max-Planck Institut für Mikrostrukturphysik, Halle, Germany — 2Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, Germany — 3Institute of Atomic and Molecular Sciences, Academia Sinica, Taiwan
It is a well-established fact that the photoemission intensity depends on the polarization state of the light and magnetization direction. For a microscopic description it is vital to include both the spin-orbit and exchange interaction on an equal footing. A photoelectron emission microscope (PEEM) allows the detection of all emitted electrons in the hemisphere. The magnetic contrast is achieved by collecting intensity images with circular polarized light of different helicities. Computing the difference images reveals magnetic domains in the real space imaging mode. In the momentum imaging the angle-resolved photoemission intensity becomes accessible. Symmetry considerations dictate a relation in momentum space of the asymmetry signal from opposite domains. We illustrate these insights by photoemission calculations on an Fe(100) surface for photon energies in the threshold region. These we compare with recent experiments on an Fe(100) surface employing a PEEM in this photon energy range. We discuss the benefit of selecting a window of the momentum of electrons which reach the detector. A careful choice of the allowed momentum range of the detected electrons leads to a selectivity of the magnetization direction of domains.