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Topic Area: Surface Physics

Displaying records 1 to 10 of 136 records.
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1. Precise determination of the spectroscopic {I}g{/I}-factor using broadband ferromagnetic resonance spectroscopy
Topic: Surface Physics
Published: 12/27/2013
Authors: Justin M Shaw, Hans Toya Nembach, Thomas J Silva, Carl T Boone
Abstract: We demonstrate that the spectroscopic {I}g{/I}−factor can be determined with high precision and accuracy by use of a broadband ferromagnetic resonance measurements and applying an asymptotic analysis to the data. Spectroscopic data used to det ...

2. 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 ...

3. Atomic-level stick-slip
Topic: Surface Physics
Published: 6/28/2013
Authors: Robert W Carpick, Rachel J. Cannara, Ashlie Martini
Abstract: Atomic level stick-slip refers to the behavior of a sliding interface, usually an atomic force microscope tip sliding along a crystalline surface, whereby the tip sticks and then slips laterally with respect to the surface in a periodic fashion. The ...

4. Primary and Secondary Droplet and Charge Transmission Characteristics of Desorption Electro-Flow Focusing Ionization
Topic: Surface Physics
Published: 5/28/2013
Authors: Thomas P Forbes, Timothy M Brewer, John G Gillen
Abstract: We present the investigation of droplet charging and charge transmission characteristics of an electro-flow focusing nozzle for desorption-based ambient ionization mass spectrometry. The electro-flow focusing geometry utilizes a concentrically flowin ...

5. 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 ...

6. 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 ...

7. 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 ...

8. Toward a Probe-Based Method for Determining Exfoliation Energies of Lamellar Materials
Topic: Surface Physics
Published: 10/4/2012
Authors: Zhao Z. Deng, Alexander Y. Smolyanitsky, Qunyang Li, Xi-Qiao Feng, Rachel J. Cannara
Abstract: We discuss a potential new measurement application based on nanotribological measurements and simulations of the model lamellar material graphite. While frictional forces always oppose motion, we have observed that friction increases with decreasing ...

9. Anomalous Friction in Suspended Graphene
Topic: Surface Physics
Published: 9/20/2012
Authors: Alexander Y. Smolyanitsky, Jason Philip Killgore
Abstract: Since the discovery of the Amonton's law and with support of modern tribological models, friction between surfaces of three-dimensional materials is known to generally increase when the surfaces are in closer contact. Here, using molecular dynamics s ...

10. Real-time measurements of plasma photoresist modifications: The role of plasma vacuum ultraviolet radiation and ions
Topic: Surface Physics
Published: 5/23/2012
Authors: Weilnboeck Florian, Nirav Kumar, Gottlieb Oehrlein, Ting-Ying Chung, D Graves, Mingqi Li, Eric A. Hudson, Eric C Benck
Abstract: Plasma-induced roughness development of photoresist (PR) can be due to synergistic interactions of surface modifications introduced by ions, bulk material modifications by ultraviolet (UV)/vacuum ultraviolet (VUV) radiation, and increased temperature ...

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