Regensburg 2010 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 10: Poster I
MA 10.55: Poster
Dienstag, 23. März 2010, 10:45–13:45, Poster A
Soft x-ray magnetic dichroism of (Ca,Sr)RuO3: Evidence for strain-dependent magnetism — •Andrea Assmann1,2, Stephan Uebe1,2, Michael Merz1, Markus Wissinger1,2, Hilbert von Löhneysen1,2, Dirk Fuchs1, Peter Nagel1, and Stefan Schuppler1 — 1Karlsruhe Institute of Technology, Institut für Festkörperphysik, Germany — 2Karlsruhe Institute of Technology, Physikalisches Institut, Germany
The 4d transition metal oxide Ca1−xSrxRuO3 exhibits ferromagnetic order in the doping range 0.4 ≲ x ≲ 1 while it is a paramagnetic metal for x ≲ 0.4. Since Ca1−xSrxRuO3 remains essentially isostructural and has a similar electronic configuration throughout the doping series, the differences in the magnetic properties might be caused by chemical pressure or magnetic dilution. To verify a possible dependence of the magnetic moments on pressure, (Ca,Sr)RuO3 films were deposited on different substrates (LSAT, STO, DyScO3=DSO), with the lattice mismatch imposing a specific strain on the epitaxial films that increases when going from LSAT to STO and DSO. The magnetic and electronic structure of the strained samples was studied by soft x-ray absorption and magnetic circular dichroism at the Ru M2,3 and O K edges. It turns out that at 20 K, the magnetic moments strongly depend on the strain: while the spin moment of samples on LSAT almost vanishes, a distinct moment is found for (Ca,Sr)RuO3 films deposited on STO and DSO. Furthermore, a significant magnetic anisotropy is observed, with the spin moments mainly oriented perpendicular to the substrate plane. Implications will be discussed.
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