Regensburg 2010 – wissenschaftliches Programm

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KR: Fachverband Kristallographie

KR 10: Poster: Multiferroics (with MA, DF, KR, DS)

KR 10.21: Poster

Dienstag, 23. März 2010, 10:45–13:45, Poster A

Magnetic Structure of Multiferroic DyMnO₃ studied by Resonant Soft X-ray Scattering — •Enrico Schierle, Victor Soltwisch, Detlef Schmitz, Ralf Feyerherm, Andrey Maljuk, Fabiano Yokaichiya, Dimitri Argyriou, and Eugen Weschke — Helmholtz-Zentrum Berlin

In multiferroic DyMnO₃, ferroelectricity is induced by a cycloidal magnetic structure of Mn-3d moments. However, it has been shown that ordering of Dy-4f moments strongly influences the ferroelectric properties of this compound. We examined the magnetic structure of Dy-4f moments by resonant magnetic X-ray scattering (RMXS) at the Dy-M₅ resonance in detail. As the main result, we show that over a large temperature range of the ferroelectric phase, Dy-4f moments form a magnetic cycloid of a chirality coupled to the direction of the electric polarization. This property can be exploited to map the ferroelectric domain structure at the crystal surface by RMXS.