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Search Publications by: John E. Bonevich (Fed)

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Displaying 101 - 125 of 176

Interparticle Interaction Effects in the Magnetic Properities NiO Nanorods

May 1, 2005
Author(s)
M Seehra, H Shim, P Dutta, A Manivannan, John E. Bonevich
Magnetic properties of sol-gel synthesized 5 nm nanorods of NiO, with and without oleic acid coating to affect interparticle interactions, are reported. Particle morphologies were studied by transmission electron microscopy and temperature variations (5 K

Origin of Exchange Decoupling Effects in High-Coercivity Air-Annealed CoPd Multilayers

May 1, 2005
Author(s)
William F. Egelhoff Jr., Robert McMichael, J Mallett, Alexander J. Shapiro, Cedric J. Powell, John E. Bonevich, J H. Judy, J H. Thomas, Erik B. Svedberg
We have achieved excellent exchange decoupling of grains in CoPd multilayers by annealing in air at 300 C. Samples exhibit a slope in the hysteresis loop close to 1.0, nucleation fields as large as 1.1 T, and coercivities as large as 1.6 T. These are among

Bayesian Inference of Nanoparticle-Broadened X-Ray Line Profiles

February 1, 2004
Author(s)
N G. Armstrong, W Kalceff, James Cline, John E. Bonevich
A single and self-contained method for determining the crystallite-size distribution and shape from experimental line profile data is presented. We have shown that the crystallite-size distribution can be determined without assuming a functional form for

Coercivities above 10 kOe in CoPd Superlattices

January 1, 2004
Author(s)
William F. Egelhoff Jr., Cedric J. Powell, L Gan, P J. Chen, H Ettendgui, D Tirosh, Robert McMichael, Mark D. Stiles, J Mallett, Alexander J. Shapiro, John E. Bonevich
We have achieved excellent grain isolation in CoPd superlattices by using 10 nm Au as both an underlayer and an overlayer and diffusing Au into the grain boundaries by annealing for approximately equal to} 30 min. at 300 degrees C. The grain isolation

Structure and Magnetic Properties of Electrodeposition Co on n-GaAs (001)

September 19, 2003
Author(s)
A X. Ford, John E. Bonevich, Robert D. McMichael, Mark D. Vaudin, Thomas P. Moffat
Co thin films have been electrodeposited on n-type (001) GaAs. The structure and texture of the films were investigated using x-ray diffraction (XRD) and transmission electron microscopy (TEM) while the magnetic properties were examined using a vibrating

Rapid Deformation of Thin Gold Layers in Polymer Matrices Studied by X-Ray Reflectivity

August 1, 2003
Author(s)
K Shin, H Wang, Sushil K. Satija, Charles C. Han, Daniel Josell, John E. Bonevich
We have used X-ray reflectivity to measure the morphological profiles of thin Au layers of three different average thicknesses sandwiched between two polystyrene layers with different molecular weights, Mw = 52.3k and Mw - 168.5k. The results showed that

Tuning the Response of Magnetic Suspensions

May 1, 2003
Author(s)
M. Chen, L Sun, John E. Bonevich, Daniel H. Reich, C L. Chien, P C. Searson
The magnetic properties of multilayer ferromagnetic/nonmagnetic (FM/NM) nanowires can be tailored by controlling the composition and length of the FM and NM segments. Manipulation of properties such as the magnetic easy axis, Curie temperature (TC)