报告摘要：

Simultaneously controlling magnetism and ferroelectricity is fundamentally important and bears the potential for a wide range of applications as for instance in sensorics and multiferroic memory devices with ultra low heat dissipation. A promising route to circumvent this problem is the appropriately synthesized composite ferroelectric(FE)/ferromagnetic(FM) nano and multilayer structures that may serve as elements in quantitatively new multiferroic devices at room temperature. Several mechanisms may underlay the magnetoelectric effect in composite multiferroic junctions, for example interfacial charge rearrangements, strain effects and exchange-bias are studied as the key ingredients for the magnetoelectric coupling [2]. We further demonstrate a mutual multiferroic response and a picosecond demagnetization/depolarization of a thin FE/FM chain in the presence of a fast oscillating electric/magnetic field or an ultrafast X-ray pulse.