Berlin 2015 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Magnetic measurement methods
MA 15.11: Vortrag
Dienstag, 17. März 2015, 12:00–12:15, H 1012
Spin-resolved hard x-ray photoemission from buried magnetic layers. — •X. Kozina1, E. Ikenaga2, C.E. Viol Barbosa3, G.H. Fecher3, C. Felser3, K. Kobayashi4, D. Kutnyakhov1, K. Medjanik1, and G. Schönhense1 — 1Institut für Physik, Johannes Gutenberg-Universität, Mainz, Germany — 2Japan Synchrotron Radiation Research Institute, SPring-8, Hyogo, Japan — 3Max Planck Institut for Chemical Physics of Solids, Dresden, Germany — 4Japan Atomic Energy Agency, SPring-8, Hyogo, Japan
We discuss the present status and future potential of spin-resolved hard X-ray photoemission (HAXPES). Recently, deeply buried CoFe layers have been studied at the BL09XU end station of SPring-8, Japan, using a large hemispherical analyzer (Scienta R-4000) and a single-channel SPLEED-type polarimeter [1]. The excitation energy of 6 keV assures significantly enhanced probing depth to access buried layers. A spin polarization of about 20% is retained during transmission of the photoelectrons emitted from the Fe 2p3/2 state through a 3-nm-thick oxide capping layer. Single-channel spin detection suffers from the low figure of merit, thus for future measurements in the valence region a multichannel spin detector is indispensable.
Therefore the Mainz group in cooperation with Univ. Wuerzburg (R. Claessen et al.) are developing a novel multichannel spin detector that will be implemented in the HAXPES endstation at PETRA III, Germany (equipped with a Specs Phoibos-225 analyzer). The status of the development is reported.
[1] G. Stryganyuk et al. Jpn. J. Appl. Phys. 51 (2012) 016602