Highlights
May 23, 2008
University of Maryland - College Park
Electromagnons in Multiferroics
A B Sushkov, M Mostovoy, R Valdes Aguilar, S-W Cheong and H D Drew
The coupling of the magnetic and ferroelectric order in multiferroics produces new excitations of mixed magnetic (magnons) and lattice (phonons) character ; electro-magnons. The investigation of these novel excitations as has revealed that they are activated only through symmetric Heisenberg exchange, even in systems in which the static polarization arises from the relativistic antisymmetric exchange.
May 23, 2008
University of Maryland - College Park
Giant Magneto-Elastic Coupling in hexagonal Y(Lu)MnO3
S. Lee, A. Pirogov, M. Kang, K. H. Jang, M. M. Yonemura, T. Kamiyama, S.-W. Cheong, F. Gozzo, N. Shin, H. Kimura, Y. Noda and J.-G. Park
Multiferroic Y(Lu)MnO3 undergoes an isostructural transition at the magnetic Neel transition, producing giant atomic displacement for every atom in the unit cell. It appears that this happens without either soft-mode degrees of freedom or orbital degrees of freedom. This extremely large magneto-elastic coupling is unprecedented - larger by two orders of magnitude than in any magnetic materials.
May 23, 2008
University of Maryland - College Park
Coaxial Nanostructures for Energy Storage
P. Banerjee, R. Liu, S.B. Lee, G.W. Rubloff
Electrochemical oxidation of aluminum produces very regular arrays of nanopores. UMD-MRSEC researchers are mastering (1) nanopore synthesis and (2) deposition of coaxial multilayers of ultrathin films into the nanopores to create a new generation of devices for storing electrical energy that function as supercapacitors and batteries. These feature simultaneously higher power and higher energy storage than the best of today's devices, meeting the growing need for storing energy derived from new but intermittent sources (solar, wind, etc.).
May 23, 2008
University of Maryland - College Park
Electrons in Graphene can Travel 100 Times Faster than in Silicon
J. H. Chen, C. Jang, S. Xiao, M. Ishigami, M. S. Fuhrer
Mobility measures how fast electrons travel in a material when an electric field (i.e.
May 19, 2008
Pennsylvania State University
Tunable refraction
X. Wang, D.-H. Kwon, D. Werner, and I.-C. Khoo (with collaborators A. Kildishev and V. Shalaev)
Materials with a negative refractive index can form super-resolution planar lenses,
sub-surface cameras or compact resonators which are otherwise impossible to realize. MRSEC researchers have predicted for the first time a tunable negative-index material with
low loss, using liquid crystals, whose operating wavelength can be changed by controlling the liquid crystal orientation.
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May 19, 2008
Pennsylvania State University
Chemotaxis
Y. Hong, N. M. K. Blackman, N. D. Kopp, A. Sen, and D. Velegol
Bimetallic gold/platinum nanorod motors spontaneously move towards hydrogen peroxide fuel when they are placed in a fuel gradient, the first time this behavior has been seen outside of the biological world.
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May 19, 2008
University of Oklahoma
Electronic Device Applications for Narrow Gap Semiconductors
Semiconductors with narrow energy gaps have electronic properties, including a high mobility and strong spin-orbit coupling, that are advantageous for electronic device applications. The switching speed of a field-effect transistor and the sensitivity of a geometrical magnetoresistor are improved by a high carrier mobility. In addition to these traditional devices, we are studying devices that take advantage of quantum-mechanical or spin-orbit effects.
May 19, 2008
University of Oklahoma
SeeS: Sooner Elementary Science and Engineering Club & Science Zone 2008
"I never knew I was so good in science. I'm going to be a research scientist when I grow up!"
May 16, 2008
Yale University
The CRISP teaching molecular beam epitaxy (MBE)
CRISP, the Yale MRSEC, has constructed a safe, user-friendly, oxide molecular beam epitaxy facility that is simple enough for effective use by undergraduates, yet capable of preparing research-grade samples
May 16, 2008
Yale University
Growth of epitaxial oxides on silicon(100): the role of strontium
Understanding the locations of atoms as they are deposited on a surface is critical for growing interfaces of electronic device quality.
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