Ferroelectricity of Europium Manganese Oxide EuMn2O5 with Helimagnetic Ordering

Strong antiferromagnetic exchange between manganese phthalocyanine and ferromagnetic europium oxide.

We report on the antiferromagnetic exchange coupling between a submonolayer of Mn(II)-phthalocyanine molecules and a ferromagnetic Eu(II)-oxide thin film. The exchange energy is larger by nearly two orders of magnitude compared to previous studies involving oxidic substrates.

Coexistence of ferroelectricity and ferromagnetism in a rubidium manganese hexacyanoferrate.

Bond- versus site-centred ordering and possible ferroelectricity in manganites.

Transition metal oxides with a perovskite-type structure constitute a large group of compounds with interesting properties. Among them are materials such as the prototypical ferroelectric system BaTiO(3), colossal magnetoresistance manganites and the high-T(c) superconductors. Hundreds of these compounds are magnetic, and hundreds of others are ferroelectric, but these properties very seldom co...

Ferroelectricity and Charge Ordering in Quasi One-Dimensional Organic Conductors

The family of molecular conductors TMTTF/TMTSF-X demonstrates almost all known electronic phases in parallel with a set of weak structural modifications of ‘anion ordering’ and mysterious ‘structureless’ transitions. Only in early 2000s their nature became elucidated by discoveries of a huge anomaly in the dielectric permittivity and by the NMR evidences for the charge ordering (disproportionat...

Atomic-level simulation of ferroelectricity in oxide materials

Recent work on using atomic-level simulation methods to study the ferroelectric properties of oxide materials is reviewed. In particular, it is illustrated how such methods can provide insights into the physical properties of a wide range of ferroelectric oxide materials inaccessible by other means. Approaches for further improvements in materials fidelity and increased range of applicability a...