Berlin 2008 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 32: Postersession II: Spinstruct./Phase Trans. (1-10); Spinelectronics (11-15); Thin Films (16 - 36); Particles/Clusters (37-45); Multiferroics (46-54); Spindynamics/Spin Torque (55 - 76); Post Deadlines (77-79)

MA 32.52: Poster

Freitag, 29. Februar 2008, 11:15–14:00, Poster E

Investigation of multiferroic properties in MnWO₄ by SHG-spectroscopy — •Michael Maringer¹, Dennis Meier¹, Thomas Lottermoser¹, Gouliang Yuan¹, Petra Becker², Ladislav Bohatý², and Manfred Fiebig¹ — ¹HISKP, Universität Bonn — ²Institut für Kristallographie, Universität zu Köln

Magnetoelectric multiferroics, i.e. compounds displaying magnetic and ferroelectric order in the same phase, attract considerable attention from the point of view of potential device application as well as fundamental physics. In the so-called spin-spiral compounds the interaction is particularly pronounced. Here we introduce optical second harmonic generation (SHG) as a powerful tool for the study of magnetic and eletronic properties and their magnetoelectric interaction in spin-spiral compounds, taking MnWO₄ as an example. SHG gives detailed information about the symmetry of crystalline phases and about symmetry changes caused by phase transitions. In particular, in MnWO₄ the (anti)ferromagnetic incommensurate phase and the magnetically induced ferroelectric, state are investigated. Although the magnetically induced spontaneous polarization is about four orders of magnitude weaker than in a conventional ferroelectric, a pronounced SHG signal is obtained.

This work was supported by the DFG through SFB 608