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Materials

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Displaying 1451 - 1475 of 2343

Higher order perpendicular magnetic anisotropy in ultra-thin Co60Fe20B20 layers and the observation of an easy cone state.

June 1, 2015
Author(s)
Justin M. Shaw, Hans T. Nembach, Mathias A. Weiler, Martin A. Schoen, Thomas J. Silva, Jonathan Z. Sun, Daniel C. Worledge
We used broadband ferromagnetic resonance (FMR) spectroscopy to measure the second and forth order perpendicular magnetic anisotropies in Ta/ Co60Fe20B20/MgO layers over a thickness range of 0.8-5 nm. For a thickness greater than 1.0 nm, the easy axis is

Small-Angle X-ray Scattering of Ionic Liquids

June 1, 2015
Author(s)
Fan Zhang, Joshua A. Hammons, Jan Ilavsky
Small angle X-ray scattering (SAXS) is a powerful technique that is used to resolve the size and structure of phases on the nanometer scale, within a sample. While these features may also be observed with other techniques, such as: electron microscopy or

Experimentally, How Does Cu TSV Diameter Influence its Stress State?

May 27, 2015
Author(s)
Chukwudi A. Okoro, Lyle E. Levine, Yaw S. Obeng, Ruqing Xu
In this work, an experimental study of the influence of Cu through-silicon via (TSV) diameter on stress build up was performed using synchrotron-based X-ray microdiffraction technique. Three Cu TSV diameters were studied; 3 µm, 5 µm and 8 µm, all of which

Real-time x-ray scattering studies of film formation in high performing small-molecule organic solar cells

May 23, 2015
Author(s)
Sebastian Engmann, Felicia A. Bokel, Andrew Herzing, Hyun W. Ro, Dean DeLongchamp, Lee J. Richter, Claudio Girotto, Bruno Caputo
We have studied the influence of the additive diiodoctane on the formation dynamics of high performance bulk heterojunction (BHJ) films based the small molecule donor 7,7'-(4,4bis(2- ethylhexyl)-4H-silolo[3,2-b:4,5-b']dithiophene-2,6-diyl)bis(6-fluoro-5-(5

Dry graphene transfer print to polystyrene and ultra-high molecular weight polyethylene ? detailed chemical, structural, morphological and electrical characterization

May 17, 2015
Author(s)
Evegeniya Lock, Dean DeLongchamp, Scott Schmucker, Blake Simpkins, Matthew Laskoski, Shawn Mulvaney, Daniel R. Hines, Mira Baraket, Sandra Hernandez, Jeremy Robinson, Paul Sheehan, Cherno Jaye, Daniel A. Fischer, Scott Walton
In this paper we apply a transfer print approach that relies on differential adhesion to remove graphene from Cu foil to polystyrene (PS) and ultra-high molecular weight polyethylene (UHMW PE) without etching of the metal foil. The polymer surfaces are

Confronting the Complexity of Commercial Carbon Nanotube Materials

May 13, 2015
Author(s)
Luis Fernando Vargas Lara, Jack F. Douglas
The morphology of commercially available carbon nanotube materials is often much more complex than the term “carbon nanotube” (CNT) would imply. Commercial CNT materials are typically composed of roughly spherical CNT domains having a highly ramified

ELEVATED TEMPERATURE ADHESION TESTING OF SPRAY-APPLIED FIRE-RESISTIVE MATERIALS

May 13, 2015
Author(s)
Christopher C. White, Kar T. Tan, Donald L. Hunston, Walter E. Byrd
Effective fire protection of steel can be fully realized when spray-applied fire resistive materials (SFRMs) are bonded sufficiently to structural steel during the event of fire. The adhesion mechanisms and characterization at elevated temperatures

Electro-thermal Simulation of 1200 V 4H-SiC MOSFET Short-Circuit SOA

May 10, 2015
Author(s)
Tam H. Duong, Jose M. Ortiz, David W. Berning, Allen R. Hefner Jr., Sei-Hyung Ryu, John W. Palmour
The purpose of this paper is to introduce a dynamic electro-thermal simulation and analysis approach for device design and short-circuit safe-operating-area (SOA) characterization using a physics-based electro-thermal Saber®* model. Model parameter

Free Space Microwave Non Destructive Characterization of Composite Materials

May 4, 2015
Author(s)
Jan Obrzut, Ahmed M. Hassan, Edward J. Garboczi
We present a free-space microwave experimental measurement system for the non-destructive testing of composite materials. The system operates in the Q- frequency band of 30 GHz to 50 GHz with fixed wave propagation distance between free-space antennas

NGD Cold Neutron Prompt Gamma-ray Activation Analysis Spectrometer at NIST

April 1, 2015
Author(s)
Rick L. Paul, Dagistan NMN Sahin, Jeremy C. Cook, Christoph W. Brocker, Richard M. Lindstrom, Donna J. O'Kelly
A new instrument for cold neutron prompt gamma-ray activation analysis (CNPGAA) has been designed and constructed as part of the recent expansion of the cold neutron guide hall at the NIST Center for Neutron Research (NCNR). Located on neutron guide NGD
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