Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 55: Poster II
MA 55.98: Poster
Freitag, 4. April 2014, 10:30–13:30, P2
A2[FeX5(H2O)] a new family of multiferroic and linear magnetoelectric materials — •Matthias Ackermann1, Sebastian Salm2, Thomas Lorenz2, Petra Becker1, and Ladislav Bohatý1 — 1Institut für Kristallographie, Universität zu Köln, Germany — 2II. Physikalisches Institut, Universität zu Köln, Germany
Magnetoelectric coupling phenomena, such as the linear magnetoelectric effect, have attracted considerable interest during the last decade, especially after the discovery of spin-driven multiferroicity in magnetically frustrated systems. Recently, we indentified (NH4)2[FeCl5(H2O)] as new multiferroic material with a strong magnetoelectric coupling and with rather complex magnetic field versus temperature phase diagrams [1]. It belongs to the family of erythrosiderite-type compounds A2[FeX5(H2O)], where A stands for an alkali metal or ammonium ion and X for a halide ion. The magnetic properties of the family have been subject of various investigations in the past. Almost all members studied so far have been identified as collinear antiferromagnets [2].
In this contribution now we present a detailed investigation of the linear magnetoelectric properties and their anisotropy of the alkali compounds K2[FeCl5(H2O)], Rb2[FeCl5(H2O)] and Cs2[FeCl5(H2O)]. Detailed magnetic field versus temperature phase diagrams are presented.
This work was supported through the Institutional Strategy of the University of Cologne within the German Excellence Initiative.
Ackermann M et al. 2013 New J. Phys. (in press, arXiv:1308.0285)
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