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Condensed Matter Colloquium Thursday, February 16, 2012

Summary: Condensed Matter Colloquium
Thursday, February 16, 2012
2 pm, Room 1201
Refreshments at 1:30 pm in Room 1305F
Xiaoshan Xu
Oak Ridge National Laboratory
Novel functional oxides and interfaces to the organics
In the quest for new types of information processing and storage, complex oxides stand out as one of
the most promising material classes. In particular, multiferroic and magnetoelectric oxides which
simultaneously exhibit more than one ferroic order have many advantages over existing materials. In
this presentation, I will talk about the hexagonal Lu-Fe-O compound as a novel multiferroic family.
The hexagonal LuFeO3 we studied is a novel multiferroic material stabilized in thin-film form. We
demonstrated the long-expected ferroelectricity using piezo-response force microscopy. More
interestingly, the hexagonal LuFeO3 exhibits complex magnetic ordering including weak
ferromagnetism above room temperature and spin-canting at 130 K. The combination the
ferroelectricity and weak ferromagnetism offers great application potential for this novel multiferroic
material. The electronic properties of inorganic/semiconducting polymer (SCP) interfaces dictate the
properties of organic electronics and organic spintronics such as organic light-emitting diodes (OLED),
organic photovoltaics (OPV), organic photo diodes, and organic spin valves. Specifically, the
electronic structure at the metal/SCP interface determines the charge collection of OPVs, the charge


Source: Appelbaum, Ian - Department of Physics, University of Maryland at College Park


Collections: Engineering; Materials Science