Masa Ishigami, J.H. Chen, W.G. Cullen, M.S. Fuhrer and E.D. Williams
Nano Lett. Doi: 10.1021/nl070613a (2007)
University of Maryland researchers have used the MRSEC’s SEM-STM facility to show what causes the corrugation of sheets of graphene, thought to be crucial in defining the novel electronic properties of this exciting new electronic material. By comparing the […]
Chenggang Tao, T. Stasevich, W.G. Cullen, T.L. Einstein and E.D. Williams
Nano Lett. doi:10.1021/nl070210a (2007)
Perfect rings of C60 molecules, lined up around circular layers of silver, reveal an important property of nanoelectronic contacts: thermal energy causes the structures to fluctuate. The movement of the molecules in the rings is captured by making repeated (“time-lapse”) […]
Electric-field tunable spin valves are being investigated
Exchange bias at ferromagnet/multiferroic interfaces has been studied for various thin film and bulk multiferroics including BiFeO3, TbMnO3, LuMnO3, and Cr2O3. Tunable spin valve structures are being explored. Magnetoresistance devices using BiFeO3 as the exchange biasing layer have been demonstrated.
Copyright (2007) University of Maryland, College Park. All rights reserved. […]
Piezoeletric materials are used for a variety of actuator and sensor applications. Finding a Pb-free replacement for the popular Pb(Zr,Ti)O3 has been a major challenge for the community.
Using the Combinatorial Laser MBE, we have rapidly mapped composition phase diagrams of doped BiFeO3 and identified a novel Pb-free composition at a structural phase boundary. Piezoelectric properties […]
M. Ranganathan, D.B. Dougherty, W.G. Cullen, T. Zhao, J.D. Weeks and E.D. Williams
Physical Review Letters 95, 225505 (2005)
Defect structures serve as nucleation sources that allow growth and evolution of structure at temperatures far lower than perfect crystalline structure would allow. Screw dislocations, which form spiral growth/etch patterns when they evolve freely on a thin film […]