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Search Publications by: Cedric J Powell ()

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Displaying 1 - 25 of 195

A Predictive Formula for the Electron Stopping Power

October 12, 2021
Author(s)
Aleksander Jablonski, S Tanuma, Cedric J. Powell
We describe the development of a new analytical formula for the electron stopping power (SP) for electron energies between 200 eV and 30 keV. This formula describes the product of the SP and the inelastic mean free path (IMFP), and is a simple function of

Artifacts That Could Be Misinterpreted as Ballistic Magnetoresistance

October 12, 2021
Author(s)
William F. Egelhoff Jr., L Gan, Erik B. Svedberg, Cedric J. Powell, Alexander J. Shapiro, Robert McMichael, J Mallett, Thomas P. Moffat, Mark D. Stiles
Theoretical physics suggests that very large magnetoresistance (MR) values might be found in certain magnetic nanocontacts if a magnetic domain wall could be localized in them with a length scale that would allow conduction electrons to transit the wall

Extended Abstract: Interfacial Scattering of Hot Electrons in Ultra-Thin Magnetic Films

October 12, 2021
Author(s)
R P. Lu, B A. Morgan, K L. Kavanagh, Cedric J. Powell, P J. Chen, F Serpa, William F. Egelhoff Jr.
In the emerging field of Spintronics the transport of hot electrons through magnetic thin films seems destined to play a key role. To help understand such transport, we have used ballistic electron emission microscopy (BEEM) to measure hot-electron

The Suppression of Orange-Peel Coupling in Magnetic Tunnel Junctions by Pre-Oxidation

October 12, 2021
Author(s)
William F. Egelhoff Jr., Robert McMichael, Cindi L. Dennis, Mark D. Stiles, Alexander J. Shapiro, Brian B. Maranville, Cedric J. Powell
We have have found that pre-oxidation of the bottom Co electrode in magnetic tunnel junctions (MTJs) very effectively suppresses orange-peel coupling. The result is a free layer that is much softer. Work by others has demonstrated that pre-oxidation is

Practical Guide for Inelastic Mean Free Paths, Effective Attenuation Lengths, Mean Escape Depths, and Information Depths in X-ray Photoelectron SpectroscopyInformation Depths in X-ray Photoelectron Spectroscopy

February 20, 2020
Author(s)
Cedric J. Powell
Information is provided on four terms that are used for different purposes in X-ray photoelectron spectroscopy (XPS): the inelastic mean free path (IMFP), the effective attenuation length (EAL), the mean escape depth (MED), and the information depth (ID)

Practical Guides for X-Ray Photoelectron Spectroscopy: First Steps in Planning, Conducting, and Reporting XPS Measurements

May 15, 2019
Author(s)
Cedric J. Powell, Donald R. Baer, Kateryna Artyushkova, Christopher R. Brundle, James E. Castle, Mark Engelhard, Karen Gaskell, John Grant, Richard Haasch, Matthew Linford, Peter Sherwood, Vincent Smentkowski, Alexander Shard
Over the past three decades, the use of x-ray photoelectron spectroscopy (XPS) in research and applications has grown to make XPS the most popular method of surface analysis. There has also been an increase in the number of new or inexperienced users along

Comparisons of Analytical Approaches for Determining Shell Thicknesses of Core-Shell Nanoparticles by X-ray Photoelectron Spectroscopy

January 25, 2018
Author(s)
Cedric J. Powell, Wolfgang Werner, Henryk Kalbe, Alexander Shard, David G. Castner
We assessed two approaches for determining shell thicknesses of core-shell nanoparticles (NPs) by X-ray photoelectron spectroscopy. These assessments were based on simulations of photoelectron peak intensities for Au-core/C-shell, C-core/Au-shell, Cu-core

NIST Electron Elastic-Scattering Cross-Section Database, Version 4.0

September 14, 2016
Author(s)
Cedric J. Powell, Aleksander Jablonski, Francesc Salvat, Angela Y. Lee
Version 4.0 of this database (SRD 64) provides values of differential elastic-scattering cross sections, total elastic-scattering cross sections, phase shifts, and transport cross sections for elements with atomic numbers from 1 to 96 and for electron