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Search Publications by: Ron B. Goldfarb (Fed)

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Displaying 1 - 25 of 82

Units for Magnetic Quantities

September 28, 2021
Author(s)
Ronald B. Goldfarb
The centimeter-gram-second (CGS) system of units was adopted by the pioneers of electromagnetism in the nineteenth century. By the early twentieth century, two limitations of the CGS system became apparent: its inability to gracefully incorporate the

Persistence of Electromagnetic Units in Magnetism

October 31, 2018
Author(s)
Ronald B. Goldfarb
The centimeter-gram-second system of electromagnetic units (EMU) has been used in magnetism since the late 19th century. The International System of Units (SI), a successor to Giorgi's 1901 meter- kilogram-second system, was adopted by the General

Enhanced superconducting transition temperature in electroplated rhenium

April 30, 2018
Author(s)
David P. Pappas, Don David, Mustafa Bal, Ilke Arslan, Paul T. Blanchard, Ronald B. Goldfarb, Dustin A. Hite, Hsiang S. Ku, Russell E. Lake, Junling Long, Alexana Roshko, Lee D. Pappas, Britton L. Plourde, Jianguo Wen, Xian Wu, Corey Rae H. McRae
We show that electroplated Re films in multilayers with noble metals such as Cu, Au, and Pd have an enhanced superconducting critical temperature relative to previous methods of preparing Re. The dc resistance and magnetic susceptibility indicate a critical

The Permeability of Vacuum and the Revised International System of Units

December 29, 2017
Author(s)
Ronald B. Goldfarb
The International System of Units (SI) is expected to be revised such that all seven base units, including the kilogram, will be defined in terms of fixed numerical values of seven defining constants. The revised SI will include a redefinition of the

A Perspective on Nonvolatile Magnetic Memory Technology

December 21, 2016
Author(s)
Ronald B. Goldfarb
Magnetic random-access memory (MRAM) is characterized by nonvolatility, low energy dissipation, high endurance (repeated writing), scalability to smaller dimensions, compatibility with complementary metal-oxide semiconductor (CMOS) processing, resistance

Synthesis of Photoactive Magnetic Nanoparticles with Atomic Layer Deposition

March 8, 2010
Author(s)
Yun Zhou, David M. King, Jianhua Li, Kathryn S. Barrett, Ronald B. Goldfarb, Alan W. Weimer
Iron-based magnetic nanoparticles have been produced by decomposition of iron oxalate powder. The micron-sized iron oxalate powder was first ground using a cryogenic milling process. A titanium dioxide (TiO 2) thin film was then deposited on the

Hydrogenization of Zr 0.9 Ti 0.1 Cr x Fe 2-x Intermetallic Compounds: Free Electron Model for Magnetic Susceptibility and Thermoelectric Power

January 24, 2008
Author(s)
S. Niyomsoan, P. Termsuksawad, Ronald B. Goldfarb, David Olson, B. Mishra, Z Gavra, V I. Kaydanov
The magnetic susceptibility and thermoelectric power of Zr 0.9Ti 0.1Cr xFe 2-x intermetallic compounds were investigated as functions of hydrogen content. The alloys are all paramagnetic, with magnetic susceptibility and Seebeck coefficient increasing with

Electromagnetics Division: Programs, Activities, and Accomplishments

January 1, 2007
Author(s)
Ronald B. Goldfarb
The Electromagnetics Division is a critical national resource for a wide range of customers. U.S. industry is the primary customer both for the division's measurement services and for technical support on the test and measurement methodology necessary for

Low Magnetic Moment PIN Diodes for High Field MRI Surface Coils

November 8, 2006
Author(s)
Pavel Voskoboynik, Ronald D. Joos, W E. Doherty, Ronald B. Goldfarb
Positive-intrinsic-negative (PIN) silicon diodes are commonly used in magnetic resonance imaging (MRI) coils to perform active or passive blocking and detuning, or to disable circuit functions. However, diode packages with large magnetic moments are known

Measurement of Hydrogen in Metal Alloys by Magnetic and Electronic Techniques

January 1, 2004
Author(s)
P. Termsuksawad, S. Niyomsoan, Ronald B. Goldfarb, V I. Kaydanov, David Olson, B. Mishra, Z Gavra
As demonstrated in this paper, magnetic and electronic measurements can be used to quantify hydrogen availability, absorption, and desorption in materials for nickel metal-hydride batteries and hydrogen storage. The ability of a metal alloy to absorb and

Magnetic Technology Division: Programs, Activities, and Accomplishments

January 1, 2003
Author(s)
Ronald B. Goldfarb
The Magnetic Technology Division develops and disseminates measurement technology for industries broadly concerned with magnetic information storage and superconductor power. The division is located in Boulder, Colorado, part of the Electronics and

Advances in Weld Hydrogen Sensors

June 1, 2002
Author(s)
David Olson, B. Mishra, R D. Smith, S. Niyomsoan, P. Termsuksawad, Y D. Park, V I. Kaydanov, Z Gavra, Ronald B. Goldfarb
Through the application of modern physics concepts, advanced hydrogen sensors are being developed for rapid determination of weld hydrogen content and distribution. Electronic, optical, and magnetic property measurements have demonstrated the ability to

Multifilmamentary Nb 3 Sn wires reacted in hydrogen gas

May 1, 2002
Author(s)
M Takayasu, R G. Ballinger, Ronald B. Goldfarb, A. A. Squitieri, P. J. Lee, David C. Larbalestier
Reaction of Nb 3Sn wires in an Icology 908 conduit in the presence of oxygen can decrease the conduit's fracture toughness. This may be avoided by reacting in a reducing atmosphere of 5% hydrogen-95% argon. The effects of the hydrogen reaction on the

Exchange bias and anisotropy in the Fe/KCoF 3 structure

February 1, 2002
Author(s)
Leszek Malkinski, Nicholas Cramer, Andrew Hutchinson, Robert E. Camley, Zbigniew J. Celinski, Danuta Skrzypek, Ronald B. Goldfarb
A new type of ferromagnet/antiferromagnet structure (fe/KCoF 3) was deposited by molecular beam epitaxy. Unidirectional and uniaxial anisotropies of 5.1 and 3.4 kA/m were measured at 23 K using ferromagnetic resonance. Magnetization measurements at 5 K

Magnetic Technology Division: Programs, activities, and accomplishments

January 1, 2002
Author(s)
Ronald B. Goldfarb
The Magnetic Technology Division develops and disseminates unique measurement technology for industries concerned with magnetic information storage and superconductor power. The division's projects are led by senior scientists, often assisted by engineers

Suppression of Flux Jumps in Marginally Stable Niobium-Tin Superconductors

March 1, 2001
Author(s)
Ronald B. Goldfarb, Loren F. Goodrich, T Pyon, E. A. Gregory
Niobium-tin superconductor wires with coalesced filaments may have reduced adiabatic stability. Magnetization measurements on such marginally stable conductors exhibit flux jumps, which appear as a sudden decrease in magnetization as the applied field is

Ralaxometry and Magnetometry of Ferritin

December 1, 1998
Author(s)
R A. Brooks, J Vymazal, Ronald B. Goldfarb, J W. Bulte, P Aisen
By combining nuclear magnetic ralaxometry on 39 ferritin samples with different iron loading with magnetometry, results were obtained that suggest a new interpretation of the core structure and magnetic properties of ferritin. These studies provide