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Topic Area: Condensed Matter Physics
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Displaying records 31 to 40 of 106 records.
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31. Density functional theory study of clean, hydrated, and defective alumina (1-102) surfaces
Topic: Condensed Matter Physics
Published: 4/1/2010
Authors: Sara E. Mason, Christopher R. Iceman, Thomas P. Trainor, Anne Marie Chaka
Abstract: We report an ab initio thermodynamic analysis of the a-Al2O3 (1-102) surface aimed at understanding the experimentally observed terminations over a range of surface preparation conditions, as well as a novel stoichiometric model for the (2x1) surface ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904117

32. Characterization of Soluble Anthradithiophene Derivatives
Topic: Condensed Matter Physics
Published: 3/18/2010
Authors: Brad Conrad, Calvin Chan, Marsha A. Loth, John E Anthony, David J Gundlach
Abstract: We will discuss the growth and electrical measurements of a newly developed, partially fluorinated anthradithiophene (F-ADT) derivative with tert-butyldiphenylsilyl (TBDMS) side groups. Single crystals of the material can be readily grown and device ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905386

33. Optimization of spin-valve parameters for magnetic bead trapping and manipulation
Topic: Condensed Matter Physics
Published: 2/6/2010
Authors: Wendy R. Altman, John M Moreland, Stephen E Russek, Victor M. Bright
Abstract: Magneto-optic Kerr effect (MOKE) and magnetoresistance (MR) measurements were used to measure the switching characteristics of spin-valve (SV) arrays currently being developed to trap and release superparamagnetic beads within a fluid medium. The eff ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904184

34. Spin-transfer dynamics in spin valves with out-of-plane magnetized CoNi free layers
Topic: Condensed Matter Physics
Published: 1/29/2010
Authors: William H Rippard, Alina M Deac, Matthew R Pufall, Justin M Shaw, Mark W Keller, Stephen E Russek, Gerrit E Bauer, Claudio Serpico
Abstract: We have measured spin-transfer-induced dynamics in magnetic nanocontact devices having a perpendicularly magnetized Co/Ni free layer and an in-plane magnetized CoFe fixed layer. The frequencies and powers of the excitations agree well with the predic ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903981

35. Phase Diagram of Magnetic Nanodisks measured by SEMPA
Topic: Condensed Matter Physics
Published: 1/20/2010
Authors: Seok-Hwan Chung, Robert D McMichael, Daniel Thornton Pierce, John Unguris
Abstract: We use Scanning Electron Microscopy with Polarization Analysis (SEMPA) to image the magnetic domain structures of individual ferromagnetic nanodisks with different diameters and thicknesses, and thereby determine the phase diagram of the magnetic gro ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903021

36. Effects of magnetism and electric field on the energy gap of bilayer graphene nanoflakes
Topic: Condensed Matter Physics
Published: 1/13/2010
Author: Hongki Min
Abstract: We study the effect of magnetism and perpendicular external electric field strengths on the energy gap of length confined bilayer graphene nanoribbons (or nanobars) using a first principles density functional electronic structure method and a semi-lo ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903804

37. Electrical Characterization of Soluble Anthradithiophene Derivatives
Topic: Condensed Matter Physics
Published: 11/19/2009
Authors: Brad Conrad, Calvin Chan, Marsha A. Loth, John E Anthony, David J Gundlach
Abstract: Organic semiconductors remain an active subject for device physics and material science because of their varied electrical properties and potential for low-cost, high-throughput roll-to-roll processing. Several high-mobility oligomers, such as pen ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905388

38. Origin of Universal Optical Conductivity and Optical Stacking Sequence Identification in Multilayer Graphene
Topic: Condensed Matter Physics
Published: 8/6/2009
Authors: Hongki Min, Allan H. MacDonald
Abstract: We predict that the optical conductivity of normal graphene multilayers is close to {sigma}^duni^=({pi}/2) e^u2^/h per layer over a broad range of frequencies. The origin of this behavior is an emergent chiral symmetry which is present in normal N-l ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902107

39. Optimization of arrays of gold nanodisks for plasmon-mediated Brillouin light scattering
Topic: Condensed Matter Physics
Published: 7/22/2009
Authors: Ward L Johnson, Sudook A Kim, Zhandos Utegulov, B. T. Draine
Abstract: Distributions of electric fields in two-dimensional arrays of gold nanodisks on a Si3N4 membrane, with light incident through the membrane, are modeled with the aim of determining array geometries for effective plasmon-mediated Brillouin light scat ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854474

40. The-Final-State Symmetry of Na 1s Core-shell Excitons in NaCl and NaF
Topic: Condensed Matter Physics
Published: 7/8/2009
Authors: Eric L Shirley, K. P. Nagle, G T Seidler, T. T. Fister, J. A. Bradley, F. C. Brown
Abstract: We report measurements of the Na 1s contribution to the nonresonant inelastic x-ray scattering (NRIXS) from NaCl and NaF. Prior x-ray absorption studies have observed two pre-edge excitons in both materials. The momentum transfer-dependence (q-depe ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901581



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