Berlin 2015 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 19: POSTER Ia
MA 19.48: Poster
Dienstag, 17. März 2015, 09:30–13:00, Poster A
Structural and magnetic properties of Fe/Pt epitaxial bilayers — •Sascha Keller1, Andres Conca1, Thomas Brächer1, Jochen Greser1, Laura Mihalceanu1, Jörg Lösch2, Burkard Hillebrands1, and Evangelos Th. Papaioannou1 — 1Fachbereich Physik, Technische Universität Kaiserslautern, Erwin-Schrödinger-Str. 56, 67663 Kaiserslautern, Germany — 2Institut für Oberflächen- und Schichtanalytik (IFOS) and Forschungszentrum OPTIMAS, Trippstadter Str. 120, 67663 Kaiserslautern, Germany
The FePt system in the form of multilayers and alloys has attracted large attention from the magnetic research community especially for technological applications in storage media. However many questions are still open concerning the correlation between magnetic properties and structure of Fe and Pt layers. Here, we address this topic with the fabrication of high quality epitaxial thin Fe/Pt bilayer structures on MgO (001) substrates by using different growth temperatures. Both, Fe and Pt surfaces are analysed by in situ ultra high vacuum scanning tunnelling microscopy and structural parameters are derived using height-height-correlation, as well as grain size analysis. X-Ray diffraction pole figures shows the 45∘ in plane epitaxial relation between the Fe layer and the MgO substrate for all growth temperatures while the Pt layer exhibits different characteristics with different growth temperatures. Longitudinal magneto-optical Kerr effect measurements show the co-existence of two kinds of anisotropies: that of a cubic term plus a uniaxial anisotropy term. The strength of each term can be manipulated according to the structural properties of the films.