FOR 520:  Functional Ferroic Devices: Physical Bases and Concepts

• Subject Area: Physics ; Computer Science, Systems and Electrical Engineering
• Term: from 2003 to 2009
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 5470500

The Research Unit aims at fundamentally explore, model, and integrate functional ferroic systems into novel concepts and potential applications. Of interest are ferroic properties in the field of ferroelectrics, ferromagnets, and coupled ferroelectric-ferromagnetic functionality. Ferroic materials are systems that show changes in symmetry upon temperature or stress. This holds for both ferroelectrics and ferromagnetics. Within the last years, ferroics substantially gained in interest due to both their extraordinary material properties and the possibilities to assemble and synthesise those systems with high chemical stoechiometry and physical reproducibility. Hence, thin film applications in microelectronic devices such as switches, memories, wave guide structures, actors and sensors, but equally volume crystal integration, for instance, in optics and optoelectronics are intensively followed these days. Due to the large variability in material and electronic properties of ferroics, many more applications are feasible that have to be explored. Functional devices made up from ferroelectric/ferromagnetic sandwiches, for instance, are structures that are easily producible with today's technologies but have to been realised yet. To gain the fundamental physical understanding and deducing feasible concepts form that knowledge, we head towards the concerted investigation in both the experimental and theoretical way. We thus combine the knowledge assembled within this Research Unit from different fields, for instance, the natural sciences as well as the engineering sciences. It is with this combination that we will be able to approach this complex thematic in a concerted and fundamental way.

• DFG Programme: Research Units

Projects

• Einkomponentige Multiferroika: Synthese und physikalische Eigenschaften (Applicant Hemker-Heß, Christian )
• Electron emission fromperowskit-tips fpr material analysis (Applicants Eng, Lukas M. ;  Gerlach, Gerald )
• Electron-emitting perovskite tips fpr innovative material evaluation (Applicant Gerlach, Gerald )
• Grenz- und Oberflächen von ferroischen Schichten (Applicant Gemming, Sibylle )
• Identification of funcionally electronic states at inner interfaces of perovskite (Applicant Grafström, Stefan )
• Identifikation funktionsrelevanter elektronischer Zustände an inneren Grenzschichten perowskitischer Strukturen (Applicant Grafström, Stefan )
• In-situ-Aufklärung der strukturellen Nah- und Fernordnung sowie gezielte nasschemische Phasensysteme perowskitverwandter Schichtsysteme (Applicant Meyer, Dirk Carl )
• Macroscopically and nanoscopically induced self-organizing structure evolution at perovskite-metal interfaces (Applicant Pompe, Wolfgang )
• Magnetische Übergangsmetallschichten auf Piezosubstraten (Applicants Gemming, Sibylle ;  Richter, Manuel )
• Piezoelektrisch steuerbare Magnete und Magnetowiderstände (Applicant Dörr, Kathrin )
• Piezoelelectrically controlled magnets and magneto resistors (Applicant Dörr, Kathrin )
• Resistiver Schalter / Sensor mit ferromagnetischen Manganaten (Applicant Dörr, Kathrin )
• Strukturelle und elektrische Charakterisierung ferroelektrischer Materialien mittels Elektronenmikroskopie und -holographie (Applicant Lichte, Hannes )
• Zentralantrag auf Gewährung von Vortrags- und Gästemitteln sowie Mitteln zur Organisation von Workshops (Applicant Eng, Lukas M. )

• Spokesperson: Professor Dr. Lukas M. Eng