Berlin 2015 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 20: POSTER Ib
MA 20.6: Poster
Dienstag, 17. März 2015, 09:30–13:00, Poster A
Threshold photoemission magnetic circular dichroism as a tool for high-resolution imaging of magnetization structures — •Maximilian Staab1,2, Hans Joachim Elmers1, Mathias Kläui1,2, and Gerd Schönhense1 — 1Johannes Gutenberg-Universität Mainz — 2MAINZ Graduate School of Excellence
Time-resolved imaging of magnetic structures and their dynamics is the domain of Kerr microscopy (being limited in resolution) and Synchrotron-based XMCD PEEM. On the quest to faster imaging we pursue the excitation with a laboratory-based Ti-sapphire laser exploiting magnetic circular dichroism in threshold photoemission (TPMCD). Our experiment uses a photoemission electron microscope (PEEM) and photoelectron excitation by circularly polarized light of 1.6 eV (fundamental of the laser) and 3.2 eV (second harmonic). The TPMCD asymmetries are based on different probabilities of transitions between spin-dependent electronic bands in the near photoemission threshold region. The TPMCD exists in one-photon-photoemission (1PPE) [1] and also in two-photon-photoemission (2PPE) [2]. In order to do spatially resolved imaging of a magnetic domain pattern we fabricated thin magnetic films consisting of a few monolayers of Co on top of a Pt(111) single crystal and performed PEEM measurements. Using a femtosecond laser as photon source will allow pump-probe experiments to add high time resolution to the PEEM setup. Project funded by DFG EL172/15. [1] K. Hild et al., Phys. Rev. B Vol. 80(22), pp. 224426, (2009) [2] K. Hild et al., Phys. Rev. Lett. 102, 057207, (2009)