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Search Publications by: Michael H. Kelley (Assoc)

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Displaying 1 - 25 of 57

Magnetic depth profiling Co/Cu multilayers to investigate magnetoresistance

October 12, 2021
Author(s)
John Unguris, D. Tulchinsky, Michael H. Kelley, Julie Borchers, Joseph Dura, Charles Majkrzak, S. Y. Hsu, R. Loloee, W. P. Pratt, J. Bass
The magnetic microstructure responsible for the metastable high resistance state of weakly coupled, as-prepared [Co(6nm)/Cu(6nm)] 20 multilayers was analyzed using polarized neutron reflectivity and scanning electron microscopy with polarization analysis

Towards More Effective Spectrum Test

May 16, 2014
Author(s)
Alan D. Skillicorn, Michael H. Kelley, Thomas J. Taylor, Eric Nelson
In response to the Presidential Memorandum on Wireless Innovation and the recommendation of the Presidential Council of Advisors on Science and Technology (PCAST), the federal government has begun the process of organizing a National Advanced Spectrum and

The Electronic Kilogram

May 1, 2001
Author(s)
Michael H. Kelley
The kilogram is the only remaining base unit in the International System of Units (SI) whose definition is based on a single physical artifact rather than on fundamental properties of nature. Effects such as environmental contamination or material loss

Future Voltage Metrology at NIST

January 1, 2001
Author(s)
Yi-hua D. Tang, June E. Sims, Michael H. Kelley
Presently NIST uses a voltage calibration path to maintain the U.S. legal volt and provide for the dissemination of an internationally consistent, accurate, reproducible and traceable voltage standard, tied to the SI units. Potential improvements and

Techniques to Measure Magnetic Domain Structures

September 11, 2000
Author(s)
Robert Celotta, John Unguris, Michael H. Kelley, Daniel T. Pierce
A summary of the current techniques for magnetic domain imaging of materials, including the practical aspects of each technique, the requirements on the sample, the specimen modification allowed and the problems normally encountered. References to more

Magnetic Depth Profiling Co/Cu Multilayers to Investigate Magnetoresistance

May 1, 2000
Author(s)
John Unguris, D Tulchinsky, Michael H. Kelley, Julie A. Borchers, Joseph A. Dura, Charles F. Majkrzak, S. Y. Hsu, R Loloee, W Pratt, J Bass
The magnetic microstructure responsible for the metastable high resistance state of weakly coupled, as-prepared [Co(6nm)/Cu(6nm)] 20 multilayer was analyzed using polarized neutron reflectivity (PNR) and scanning electron microscopy with polarization

Observation of antiparallel magnetic order in weakly coupled Co/Cu multilayers

May 23, 1998
Author(s)
Julie Borchers, Joseph Dura, John Unguris, D Tulchinsky, Michael H. Kelley, Charles Majkrzak, S. Y. Hsu, R Loloee, W Pratt, J Bass
Polarized neutron reflectivity and scanning electron microscopy with polarization analysis are combined to determine the magnetic structure of Co(6 nm)/Cu(6 nm) multilayers. These data resolve a controversy regarding the low-field state of giant

Fabrication and Domain Imaging of Iron Magnetic Nanowire Arrays

May 1, 1998
Author(s)
D Tulchinsky, Michael H. Kelley, Jabez J. McClelland, R Gupta, Robert Celotta
Arrays of magnetic nanowires are fabricated by using a corrugated surface, produced by chromium atoms laser-focused in a one-dimensional standing wave, as a shadow mask for an iron evaporator. The deposited iron forms a periodic array consisting of

Optimizing the NIST Magnetic Imaging Reference Sample

September 1, 1997
Author(s)
Paul Rice, Stephen E. Russek, J Hoinville, Michael H. Kelley
We have further developed the NIST magnetic imaging reference sample to include a magnetic pattern which can indicate the magnetic polarity of a magnetic force microscope tip. Several samples cut from the same disk were measured with a single tip. We have

Scanning Electron Microscopy with Polarization Analysis (SEMPA)

January 1, 1997
Author(s)
John Unguris, M Scheinfein, Michael H. Kelley, A Gavrin, Robert Celotta, Daniel T. Pierce
Scanning Electron Microscopy with Polarization Analysis (SEMPA) is a technique for the high spatial resolution imaging of magnetic microstructure. It employs a Scanning Electron Microscope (SEM) to create a finely focused electron beam on the surface of a

The NIST Magnetic Imaging Reference Sample

January 1, 1997
Author(s)
Paul Rice, Stephen E. Russek, J Hoinville, Michael H. Kelley
We have further developed the NIST magnetic imaging reference sample to include a magnetic pattern which can indicate the magnetic polarity of a magnetic force microscope tip. Several samples cut from the same disk were measured with a single tip. We have

Domain Structures in Magnetoresistive Granular Metals

January 1, 1995
Author(s)
A Gavrin, Michael H. Kelley, J Xiao, C Chien, Robert Celotta
We have imaged the magnetic domain structure of several heterogeneous Co xAg 1-x alloys by using scanning electron microscopy with polarization analysis. These images show that extended domain structures exist in both the as-deposited samples and in

Uncertainty Intervals for Polarized Beam Scattering Asymmetry Statistics

July 1, 1993
Author(s)
Kevin Coakley, Jabez J. McClelland, Michael H. Kelley, Robert Celotta
In many scattering experiments, the quantity of most direct physical interest is a measure of the difference between two closely related scattering signals, each generated by a Poisson scattering process. This difference is often expressed in terms of an

Spin-Resolved Elastic Scattering of Electrons from Sodium

April 1, 1993
Author(s)
Steven R. Lorentz, R E. Scholten, Jabez J. McClelland, Michael H. Kelley, Robert Celotta
Angle-resolved ratios of the separate triplet and singlet spin channel cross sections have been measured for elastic scattering of spin-polarized electrons from optically pumped spin-polarized sodium atoms. The triplet-to-singlet ratios axe reported at

Scattering of Polarized Electrons from Optically Pumped Sodium Atoms

January 1, 1992
Author(s)
Michael H. Kelley, Jabez J. McClelland, Steven R. Lorentz, R E. Scholten, Robert Celotta
We have measured the spin-dependence for elastic and superelastic scattering of spin-polarized electrons from optically prepared sodium atoms at selected incident energies from 1.0 to 54.4 eV and for scattering angles ranging from 10-degrees to 140-degrees

Spin-Polarized Photoemission Spectroscopy of Magnetic Surfaces Using Undulator Radiation

January 1, 1992
Author(s)
Philip Johnson, S Hulbert, R Klaffky, N Brookes, Andrew Clarke, B Sinkovic, N. Smith, Robert Celotta, Michael H. Kelley, Daniel T. Pierce, M Scheinfein, B Waclawski, B.O. Wells
A beamline has been established at the National Synchrotron Light Source to perform angle-resolved photoemission experiments on magnetic surfaces with spin sensitivity. The system has two novel features: it uses a miniature electron-spin polarization

Spin-Resolved Elastic Scattering of Electrons from Sodium Below the Inelastic Threshold

December 30, 1991
Author(s)
Steven R. Lorentz, R E. Scholten, Jabez J. McClelland, Michael H. Kelley, Robert Celotta
A very stringent test of low-energy electron-atom collision theory is made in the most favorable energy regime for the close-coupling approximation. Data are presented as exchange asymmetries in angle-resolved elastic scattering of spin-polarized electrons

Spin-resolved Superelastic Scattering from Sodium at 10 and 40 eV

December 28, 1991
Author(s)
R E. Scholten, Steven R. Lorentz, Jabez J. McClelland, Michael H. Kelley, Robert Celotta
Spin-resolved superelastic electron scattering from sodium has been measured at total energies of 10 and 40 eV, for scattering angles between 10° and 140°. The angular momentum transfer, Lperp}, and the spin-resolved components L(Tperp} and L(S)perp} have

Scanning Electron Microscopy With Polarization Analysis (SEMPA)

January 1, 1990
Author(s)
M Scheinfein, John Unguris, Michael H. Kelley, Daniel T. Pierce, Robert Celotta
This was an extended abstract prepared for inclusion in the Microscopy & Microanalysis '99 Proceedings. It is a summary of Observation of Antiparallel Magnetic Order in Weakly Coupled Co/Cu Multilayers, which was published in Physical Review Letters, Vol

Spin-polarization, Orientation, and Alignment in Electron-Atom Collisions

January 1, 1990
Author(s)
Michael H. Kelley
The use of state-selection techniques has added greatly to our fundamental understanding of electron-atom collision phenomena. In particular, measurements of atomic orientation and alignment in electron impact excitation, and measurements of spin