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 20.35: Poster

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

Ferroelectricity and Magnetic Structure of Mn Moments in Multiferroic GdMnO₃ — •Enrico Schierle¹, Victor Soltwisch¹, Christoph Trabant^1,2, Alex Frano^1,3, Detlef Schmitz¹, Fabiano Yokaichiya^1,6, Andrej Maljuk^1,4, Dimitri Argyriou^1,5, and Eugen Weschke¹ — ¹Helmholtz-Zentrum Berlin für Materialien und Energie, Germany — ²II. Physikalisches Institut, Universität zu Köln, Germany — ³MPI-FKF Stuttgart, Germany — ⁴IFW, Dresden, Germany — ⁵European Spallation Source, Lund, Sweden — ⁶Laboratrio Nacional de Luz Sincrotron, Campinas-SP, Brasil

Orthorhombic REMnO₃ oxides can show strongly coupled ferroelectric (FE) and magnetic order, with FE polarization P induced by magnetic cycloids of the Mn spins[1,2]. However, from recent X-ray diffraction studies, there is growing evidence for a decisive role of ordering of the RE-4f moments as well and it seems that a large part of P can be explained by ionic displacements not necessarily connected with cycloidal magnetic order of Mn moments[3,4,5]. We employed Resonant Soft X-Ray Scattering at the Mn-L_2,3 resonance to prove the existence of a ferroelectric phase at the surface of GdMnO₃ even in zero external magnetic field and to examine its connection to the magnetic structure of the Mn moments in an element specific way.
Kimura et al., Nature 426, 55-58 (2003) [2] Kenzelmann et al., PRL 95, 087206 (2005) [3] Schierle et al., PRL 105, 167207 (2010) [4] Feyerherm et al., Journal of Physics: Conference Series 200, 012032 (2010) [5] Walker et al., Science 333, 1273 (2011)