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NIST Authors in Bold

Displaying 2376 - 2400 of 3361

Kitaev Interactions in the Co Honeycomb Antiferromagnets Na 3 Co 2 SbO 6 and Na 2 Co 2 TeO 6

December 24, 2020
Author(s)
M. Songvilay, J. Robert, Jose Rodriguez Rivera, William D. Ratcliff, F. Damay, V. Baledent, M. Jimenez-Ruiz, P. Lejay, E. Pachoud, A. Hadj-Azzem, V. Simonet, C. Stock
Co 2+ ions in an octahedral crystal field, stabilize a jeff = 1⁄2 ground state with an orbital degree of freedom and and have been recently put forward for realising Kitaev interactions, a prediction that we have tested by investigating spin dynamics in

Sixfold Enhancement of Superconductivity in a Tunable Electronic Nematic System

March 1, 2020
Author(s)
Christoper Eckberg, Daniel J. Campbell, Tristin Metz, John Collini, Halyna Hodovanets, Tyler Drye, Peter Zavalij, Morten H. Christensen, Rafael M. Fernandes, Sangjun Lee, Peter Abbamonte, Jeffrey W. Lynn, Johnpierre Paglione
The electronic nematic phase, wherein electronic degrees of freedom lower the crystal rotational symmetry, is a common motif across a number of high-temperature superconductors. However, understanding the role and influence of nematicity and nematic

Spin-orbit coupled bosons in one dimension: Emergent gauge field and Lifshitz transition

May 16, 2019
Author(s)
Ian B. Spielman, William Cole, Junhyun Lee, Khan Mahmud, Yahya Alavirad, Jay Sau
We propose the two component spin-orbit coupled Bose liquid as a platform for studying quantum criticality in itinerant magnets. Apart from being pervasive in the solid state, quantum critical fluctuations in such itinerant systems often involve the

Induced Current Effects in Josephson Voltage Standard Circuits

March 8, 2019
Author(s)
Anna E. Fox, Grace E. Butler, Miranda L. Thompson, Paul D. Dresselhaus, Samuel P. Benz
A study has been performed to understand the effects of magnetic field induced current in Josephson voltage standard circuits. Inductive filtering is an essential component in Josephson voltage standard devices for isolation of the microwave and DC bias

Inhomogeneous magnon scattering during ultrafast demagnetization

October 25, 2018
Author(s)
Ronny J. Knut, Erna Delczeg-Czirjak, Somnath Jana, Justin M. Shaw, Hans T. Nembach, Yaroslav Kvashnin, Robert Stefaniuk, Rameez Malik, Patrik Grychtol, Dmitriy Zusin, Christian Gentry, Raghuveer Chimata, Manuel Pereiro, Johan Soderstrom, Emrah Turgut, Martina Ahlberg, Johan Akerman, H C. Kapteyn, Margaret M. Murnane, Dario A. Arena, Olle Eriksson, Olof Karis, Thomas J. Silva
Ni 0.8Fe 0.2 (Py) and Py alloyed with Cu exhibit intriguing ultrafast demagnetization behavior, where the Ni magnetic moment shows a delayed response relative to the Fe, an effect which is strongly enhanced by Cu alloying. We have studied a broad range of

Bayesian Method for the Analysis of Diffraction Patterns using BLAND

December 1, 2016
Author(s)
Joseph E. Lesniewski, Steven M.T. Disseler, Dylan J. Quintanta, Paul A. Kienzle, William D. Ratcliff
Rietveld refinement of x-ray and neutron diffraction patterns is routinely used to solve crystal and magnetic structures of organic and inorganic materials over many length scales. Despite its success over the last several decades, conventional Rietveld

Measuring residual resistivity ratio of high-purity Nb

July 27, 2004
Author(s)
Loren F. Goodrich, Theodore C. Stauffer, Jolene Splett, Dominic F. Vecchia
We compared methods of measuring the residual resistivity ratio (RRR) of high-purity Nb using transport current. Our experimental study is intended to answer some fundamental questions about the best measurement for RRR and the biases that may exist among

Variable mutual inductance in critical-current measurements

January 1, 2002
Author(s)
Loren F. Goodrich, Theodore C. Stauffer
We have investigated the mutual inductance observed on pairs of voltage tapes that are soldered to superconducting wires in order to measure the voltage-current (V-I) characteristics & determine the critical current. Measurements on a Nb-Ti superconductor

Assessment of Moisture Measurement Techniques for Ceramic Processing

August 1, 2000
Author(s)
P S. Wang
This report presents an assessment of moisture measurement tests by techniques currently available for ceramic processing applications. The techniques tested include near infrared, microwave, proton nuclear magnetic resonance, magnetic resonance imaging

Selected Programs at the New SURF III Electron Storage Ring

June 1, 2000
Author(s)
Mitchell L. Furst, Uwe Arp, G P. Cauchon, A D. Hamilton, L R. Hughey, Thomas B. Lucatorto, Charles S. Tarrio
The conversion of the electron storage ring at NIST (the National Institute of Standards and Technology) to SURF III (the Synchrotron Ultraviolet Radiation Facility) has resulted in a significant improvement to the azimuthal uniformity of magnetic field as

Ferromagnetic Resonance Studies of NiO-Coupled Thin Films of Ni 80 Fe 20

October 1, 1998
Author(s)
Robert D. McMichael, Mark D. Stiles, P J. Chen, William F. Egelhoff Jr.
This paper describes ferromagnetic resonance (FMR) and magnetoresistive measurements of thin magnetic films coupled to antiferromagnetic films. First, FMR results for films of Ni 80Fe 20 show that coupling to NiO produces the angular variation in the

Ferromagnetic Resonance Studies of NiO-coupled Thin Films of Ni 80 Fe 20

January 1, 1998
Author(s)
Robert McMichael, Mark D. Stiles, P J. Chen, William F. Egelhoff Jr.
This paper describes ferromagnetic resonance (FMR) and magnetoresistive measurements of thin magnetic films coupled to antiferromagnetic films. First, FMR results for films of Ni 80Fe^d20 show that coupling to NiO produces the angular variation in the

Fetal magnetocardiography measurements with a multichannel microfabricated atomic magnetometer array

June 3, 2015
Author(s)
Svenja A. Knappe, Orang Alem, Tilmann H. Sander, Rahul R. Mhaskar, John LeBlanc, Hari Eswaran, Uwe Steinhoff, Yoshio Okada, John E. Kitching, Lutz Trahms
Following the rapid progress in the development of atomic magnetometer technology for the measurement of magnetic fields in the femtotesla range, a successful assembly of individual sensors into an array of nearly identical sensors is within reach. The

Rectangular-Waveguide Impedance

May 22, 2015
Author(s)
Dylan F. Williams, Jeffrey A. Jargon, Uwe Arz, Paul D. Hale
We discuss the role of the wave impedance in temporal measurements in rectangular waveguide and present a simple rule-of-thumb for estimating the difference of the temporal electric and magnetic field waveforms supported by the dominant TE10 mode. We also

Chip-scale atomic devices: precision atomic instruments based on MEMS

October 5, 2008
Author(s)
John E. Kitching, Svenja A. Knappe, Vladislav Gerginov, Vishal Shah, Peter D. Schwindt, Brad Lindseth, Elizabeth A. Donley, Ying-ju Wang, Eleanor Hodby, Matt Eardley, Ricardo Jimenez Martinez, William C. Griffith, Andrew Geraci, Jan Preusser, Tara C. Liebisch, Hugh Robinson, Leo Hollberg
We describe recent work at NIST to develop compact, low-power instruments based on a combination of precision atomic spectroscopy, advanced diode lasers and microelectromechanical systems (MEMS). Designed to be fabricated in parallel in large numbers

Behavior of MAG Standard Problem No. 2 in the Small Particle Limit

May 1, 2000
Author(s)
Michael J. Donahue, Donald G. Porter, Robert D. McMichael, J Eicke
For a uniformly magnetized rectangular particle with dimensions in the ratio 5 : 1 : 0.1, the coercive and switching fields in the (1,1,1) direction are determined to be H c / M s = 0.057069478 and H s / M s = 0.057142805. Previous micromagnetic

Topological Surface State Annihilation and Creation in SnTe/Crx(BiSb)2-xTe3 Heterostructures

July 19, 2022
Author(s)
Peng Deng, Alexander Grutter, Yulei Han, Megan E. Holtz, Peng Zhang, Patrick Quarterman, Shuaihang Pan, Shifei Qi, Zhenhua Qiao, Kang L. Wang
Topological surface states are a new class of electronic states with novel properties, including the potential for annihilation between surface states from two topological insulators at a common interface. Here, we report the annihilation and creation of

Spin and Charge Interconversion in Dirac-Semimetal Thin Films

November 16, 2021
Author(s)
Wilson Yanez, Yongxi Ou, Run Xiao, Jahyun Koo, Jacob T. Held, Supriya Ghosh, Jeffrey Rable, Timothy Pillsbury, Enrique Gonzalez Delgado, Kezhou Yang, Juan Chamorro, Alexander Grutter, Patrick Quarterman, Anthony Richardella, Abhronil Sengupta, Tyrel M. McQueen, Julie Borchers, K. A. Mkhoyan, Binghai Yan, Nitin Samarth
We report spin-to-charge and charge-to-spin conversion at room temperature in heterostructure devices that interface an archetypal Dirac semimetal, Cd 3As 2, with a metallic ferromagnet,Ni 0.80Fe 0.20 (permalloy). The spin-charge interconversion is

Second Chern number of a quantum-simulated non-Abelian Yang monopole

June 29, 2018
Author(s)
Ian B. Spielman, Francisco Salces Carcoba, Yuchen Yue, Abigail Perry, Seiji Sugawa
Topological order is often quantified in terms of Chern numbers, each of which classifies a topological singularity. Here, inspired by concepts from high-energy physics, we use quantum simulation based on the spin degrees of freedom of atomic Bose-Einstein
Displaying 2376 - 2400 of 3361
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