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Recently, we predicted based on symmetry considerations that KMnFeF$_{6}$ andBa$_{2}$Ni$_{7}$F$_{18}$ are likely magnetoelectric multiferroic materials. Inthis contribution, we investigate with Landau theory and crystal structureconsiderations the polarization and the linear magnetoelectric effect in thesematerials. Based on these two examples, we show that any magnetoferroelectricwill display additional electrical polarization below its magnetic orderingtemperature. This additional electrical polarization is not related to thelinear magnetoelectric effect. Its magnitude depends on the dielectricsusceptibility.

Phenomenological Landau analysis of predicted magnetoelectric fluorides: KMnFeF$_{6}$ and Ba$_{2}$Ni$_{7}$F$_{18}$