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MA: Fachverband Magnetismus
MA 20: Poster I - Biomagnetism, FePt Nanoparticles, Magnetic Particles/Clusters, Magnetic Materials, Magnetic Semiconductors, Half-metals/Oxides, Multiferroics, Topological Insulators, Spin structures/Phase transitions, Electron theory/Computational micromagnetics, Magnetic coupling phenomena/Exchange bias, Spin-dependent transport, Spin injection/spin currents, Magnetization/Demagnetization dynamics, Magnetic measurement techniques
MA 20.42: Poster
Tuesday, March 27, 2012, 12:15–15:15, Poster A
Diffraction Anomalous Fine Structure of Ho2PdSi3 and YMn2−ξFeξO5 — •Melanie Nentwich1, Matthias Zschornak1, Carsten Richter1, 2, and Dirk C. Meyer1 — 1TU Bergakademie Freiberg, Institut für Experimentelle Physik, Leipziger Straße 23, 09596 Freiberg — 2Hamburger Synchrotronstrahlungslabor HASYLAB at DESY
Diffraction Anomalous Fine Structure (DAFS) is a site-selective method for studying local electronic structures. As an advantage over X–ray Absorption Fine Structure (XAFS) it is possible to differentiate between atoms of the same kind but different Wyckoff positions which is especially useful for site–ordered mixed valence systems. Here, this method was applied to study the substitution of Mn atoms with Fe on the octahedral and pyramidal sites in YMn2−ξFeξO5 [2]. Further, the c–ordering of Pd substitutes on Si sites according to a super structure proposal from F. Tang et al. [1] was investigated for the intermetallic compound Ho2PdSi3. Theoretical modelling was performed using the FDMNES code [3]. The measurements of the experimental data have been carried out at beamline E2 of DESY/HASYLAB Hamburg.
[1] F. Tang et al., Phys. Rev. B 84, 104105 (2011).
F. Wunderlich et al., Phys. Rev. B 82, 014409 (2010).
Y. Joly, Phys. Rev. B 63, 125120-125129 (2001).