Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 46: Magnetic Measurement Methods
MA 46.3: Vortrag
Donnerstag, 10. März 2016, 16:00–16:15, H33
Magnetization and Spin Sensitive Real and Momentum Space Imaging in Laser-based Photoemission — •Maximilian Staab1,2, Dima Kutnyakhov1, Robert Wallauer1, Hans Joachim Elmers1,2, Mathias Kläui1,2, and Gerd Schönhense1,2 — 1Johannes Gutenberg-Universität Mainz — 2Graduate School Materials Science in Mainz
On the quest to faster magnetic imaging we exploit the magnetic circular dichroism in threshold photoemission (TPMCD) in the excitation by a laboratory-based Ti-sapphire laser, providing circularly polarized light of 1.6 eV and 3.2 eV. The corresponding asymmetries are based on different probabilities of transitions between spin-dependent electronic bands in the near photoemission threshold region. We show spatially resolved PEEM images of the magnetic domain pattern of epitaxially grown ultrathin Co/Pt(111) films. By utilizing time-of-flight momentum microscopy we investigate the electronic transitions that are responsible for the TPMCD effect. The time-of-flight momentum microscope allows for an efficient acquisition of angular-resolved photoemission spectra [1]. Additionally, we perform spin-resolved measurements with this method by reflecting the imaging electron beam at an Ir(001) spin filter crystal. While maintaining the band structure pattern they show an overall high spin asymmetry with a pronounced maximum in a flat band slightly below the Fermi level. The spin polarization and the magnetic circular dichroism are compared with theoretical calculations [2]. [1]G. Schönhense, K. Medjanik, H.-J. Elmers, JESRP, 200, 84-118,(2015) [2]K. Hild et al., Phys. Rev. B 82, 195430,(2010)