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1. Adhesion-dependent negative friction coefficient on chemically modified graphite at the nanoscale
Topic: Surface Physics
Published: 10/14/2012
Authors: Zhao Z. Deng, Alexander Y Smolyanitsky, Qunyang Li, Xi-Qiao Feng, Rachel J. Cannara
Abstract: A negative friction coefficient is observed for graphite using atomic force microscopy. The magnitude of the friction coefficient increases with adhesion, which we control by exposing graphite to different conditions. We demonstrate that the negative ...

2. Atomistic Factors Governing Adhesion between Diamond, Amorphous Carbon, and Model Diamond Nanocomposite Surfaces
Topic: Surface Physics
Published: 10/1/2010
Authors: Pamela L Piotrowski, Rachel J. Cannara, Guangtu Gao, Joseph J Urban, Robert W Carpick, Judith A Harrison
Abstract: Complementary atomic force microscopy (AFM) and molecular dynamics (MD) simulations were conducted to determine the work of adhesion for diamond(111)(1x1) and diamond(001)(2x1) surfaces paired with other carbon-based materials. In the AFM experiments ...

3. Controlling Formation of Atomic Step Morphology on Micro-patterned Si (100)
Topic: Surface Physics
Published: 8/9/2011
Authors: Kai Li, Pradeep Narayanan Namboodiri, Sumanth B. Chikkamaranahalli, Gheorghe Stan, Ravikiran Attota, Joseph Fu, Richard M Silver
Abstract: Micro scale features are fabricated on Si (100) surfaces using lithographic techniques and then thermally processed in an ultra high vacuum (UHV) environment. Samples are flash heated at 1200 °C and further annealed at 1050 °C for 18 hours. The surf ...

4. Damping phenomena in Co^d90^Fe^d10^/Ni multilayers and alloys
Topic: Surface Physics
Published: 7/6/2011
Authors: Justin M Shaw, Hans Toya Nembach, Thomas J Silva
Abstract: We used perpendicular ferromagnetic resonance to measure the damping parameter in Co^d90^Fe^d10^/Ni multilayers over a wide range of layer thicknesses. The magnetic anisotropy within this range varied from in-pane to out-of-plane. We measured (Co^d90 ...

5. Effect of Surface Modes on Photon Propagation through Dielectric Bandgaps
Topic: Surface Physics
Published: 10/28/2009
Authors: Natalia Malkova, Sergey V Polyakov, Alan L Migdall, Garnett W Bryant
Abstract: We investigate the Hartman saturation effect of photons traveling through barriers created by bandgaps of multilayer stacks. In particular, we investigate theoretically the recently observed jumps in photon transversal times due to adding a single l ...

6. Effects of surface compliance and relaxation on the frictional properties of lamellar materials
Topic: Surface Physics
Published: 6/10/2014
Authors: Alexander Y Smolyanitsky, Shuze Zhu, Zhao Z. Deng, Teng Li, Rachel J. Cannara

7. Feeling Small: Exploring the tactile perception limits
Topic: Surface Physics
Published: 9/12/2013
Authors: Lisa Skedung, Martin Arvidsson, Jun Y. Chung, Christopher M Stafford, Birgitta Berglund, Mark W. Rutland
Abstract: The human finger is exquisitely sensitive in distinguishing different materials, but the question remains as to what length scales are capable of being discriminated in active touch? We combine psychophysical approaches with materials science to man ...

Topic: Surface Physics
Published: 6/1/2011
Authors: Joshua M Pomeroy, Russell Lake, C E Sosolik
Abstract: The electrical conductance of magnetic tunnel junction (MTJ) devices whose ultra-thin aluminum oxide tunnel barrier was irradiated by highly charged ions (HCIs) increases linearly with the fluence of HCIs, while retaining a current-voltage relationsh ...

9. Measurement of orbital asymmetry and strain in Co^d90^Fe^d10^/Ni multilayers and alloys: Origins of perpendicular anisotropy
Topic: Surface Physics
Published: 2/13/2013
Authors: Justin M Shaw, Hans Toya Nembach, Thomas J Silva
Abstract: We use broadband ferromagnetic resonance spectroscopy and x-ray diffraction to investigate the fundamental origin of perpendicular anisotropy in Co^d90^Fe^d10^/Ni multilayers. By careful evaluation of the spectroscopic {I}g{/I}-factor, we determine ...

10. Nanoscale interfacial friction and adhesion on supported versus suspended monolayer and multilayer graphene
Topic: Surface Physics
Published: 1/8/2013
Authors: Zhao Z. Deng, Nikolai Nikolayevich Klimov, Santiago Solares, Teng Li, Hua Xu, Rachel J. Cannara
Abstract: Using atomic force microscopy (AFM), we study the adhesive, frictional and elastic properties of supported and suspended graphene exfoliated onto pit-patterned silicon dioxide-on-silicon (SiO2/Si) substrates. In spite of the greater adhesive force b ...

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