Berlin 2012 – wissenschaftliches Programm

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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

Dienstag, 27. März 2012, 12:15–15:15, Poster A

Diffraction Anomalous Fine Structure of Ho₂PdSi₃ and YMn_2−ξFe_ξO₅ — •Melanie Nentwich¹, Matthias Zschornak¹, Carsten Richter^{1, 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 YMn_2−ξFe_ξO₅ [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).