The olivine compound Mn 2 GeO 4 is shown to feature both a ferroelectric polarization and a ferromagnetic magnetization that are directly coupled and point along the same direction. We show that a spin spiral generates ferroelectricity, and a canted commensurate order leads to weak ferromagnetism. Symmetry suggests that the direct coupling between the ferromagnetism and ferroelectricity is mediated by Dzyaloshinskii-Moriya interactions that exist only in the ferroelectric phase, controlling both the sense of the spiral rotation and the canting of the commensurate structure. Our study demonstrates how multicomponent magnetic structures found in magnetically frustrated materials like Mn 2 GeO 4 provide a new route towards functional materials that exhibit coupled ferromagnetism and ferroelectricity.
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Coupling of Magnetic and Ferroelectric Hysteresis by a Multicomponent <?format ?>Magnetic Structure in Mn 2 GeO 4
White, J. S; Honda, T. S; Kimura, K. S; Kimura, T. S; Niedermayer, Ch. S; Zaharko, O. S; Poole, A. S; Roessli, B. S; Kenzelmann, M. S
Follow Physical Review Letters
, Volume 108 (7)
American Physical Society (APS) – Feb 17, 2012
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