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Displaying 1426 - 1450 of 3361

Effect of Capping Material on Interfacial Ferromagnetism in FeRh Thin Films

January 31, 2014
Author(s)
C. Baldasseroni, G. K. Palsson, C. Bordel, S. Valencia, A. A. Unal, F. Kronast, S. Nemsak, C. S. Fadley, Julie Borchers, Brian B. Maranville, F. Hellman
The role of the capping material in stabilizing a thin ferromagnetic layer at the interface between an FeRh film and cap in the nominally antiferromagnetic phase at room temperature was studied by x-ray magnetic circular dichroism in photoemission electron

Spin Dynamics in the Time and Frequency Domain

September 15, 2012
Author(s)
Thomas J. Silva
The current status of experimental approaches to analyze the spin wave dynamics in ferromagnetic nanoscale structures is reviewed. Recent developments in frequency- and field swept spectroscopy to determine the resonant response of nanoscale ferromagnets

Physical Properties of LnAg y X 4-y (Ln =La, Ce; X = Al, Ga; y 0.72)

April 1, 2008
Author(s)
Jung Y. Cho, Monica Moldovan, David P. Young, Nathan Lowhorn, Julia Y. Chan
Single crystals of LnAg(y)X(4-y) (Ln = La, Ce; X = Al, Ga; y 0.72) were synthesized by aluminum or gallium flux and characterized by single crystal X-ray diffraction. LnAg(y)X(4-y) (Ln = La, Ce; X = Al, Ga; y 0.72) crystallize in the tetragonal space group

Hysteresis in Transport Critical-Current Measurements of Oxide Superconductors

March 1, 2001
Author(s)
Loren F. Goodrich, Theodore C. Stauffer
We have investigated magnetic hysteresis in transport critical-current (I c) measurements of Ag-matrix (Bi, Pb) 2Sr 2Ca 2Cu 3O 10-x (Bi-2223) and AgMg-matrix Bi 2Sr 2CaCu 2O 8+x (Bi-22-2212) tapes. I c hysteresis causes measurements with field, angle, and

Sub-Millisecond Time-Resolved Small-Angle Neutron Scattering Measurements at NIST

June 3, 2020
Author(s)
Charles J. Glinka, Markus NMN Bleuel, Peter NMN Tsai, Dominika Zakutna, Dirk Honecker, Dominique Dresen, Flore Mees, Sabrina Disch
Instrumentation for sub-millisecond time-resolved SANS measurements at the National Institute of Standards and Technology (NIST) is described and applied to the reorientation dynamics of elongated hematite nanoparticles. Instrumentation for time-resolved

Chaotic Scattering and Escape Times of Marginally Trapped Ultracold Neutrons

July 1, 2005
Author(s)
Kevin Coakley, J M. Doyle, S N. Dzhosyuk, L Yang, Paul R. Huffman
We compute classical trajectories of ultracold neutrons (UCNs) in a superconducting Ioffe-type magnetic trap using a symplectic integration method. We find that the computed escape time for a particular set of initial conditions (momentum and position)

Unusual Heavy-mass Nearly Ferromagnetic State with a Surprisingly Large Wilson Ratio in Double Layered Ruthenates (Sr 1-x Ca x ) 3 Ru 2 O 7

November 14, 2008
Author(s)
Z Qu, L Spinu, H Q. Yuan, V Dobrosavljevic, Wei Bao, Jeffrey Lynn, M Nicklas, J Peng, T J. Liu, F Fobes, E Flesch, Z Q. Mao
We report a very unusual heavy-mass nearly ferromagnetic state with a surprisingly large Wilson ratio Rw (e.g., Rw 700 for x = 0.2) in double layered ruthenates (Sr 1- xCa x) 3Ru 2O 7. This state does not evolve into a long-range ferromagnetic order

Engineered two-dimensional Ising interactions on a trapped-ion quantum simulator with hundreds of spins

April 26, 2012
Author(s)
Joseph W. Britton, Brian C. Sawyer, Adam Keith, C.-C. Joseph Wang, James K. Freericks, Hermann Uys, Michael Biercuk, John J. Bollinger
The presence of long-range quantum spin correlations underlies a variety of physical phenomena in condensed matter systems, potentially including high-temperature superconductivity, making this a fertile area for exploration. Unfortunately, many properties

Atom Loss From Bose-Einstein Condensates Due to Feshbach Resonance

August 1, 1999
Author(s)
V Yurovsky, A Ben-Reuven, Paul S. Julienne, Carl J. Williams
In recent experiments on Na Bose-Einstein condensates [S. Inouye et al., Nature 392, 151 (1998); J. Stenger et al., Phys. Rev. Lett. 82, 2422 (1999)], large loss rates were observed when a time-varying magnetic field was used to tune a molecular Feshbach

Anomalous Supercurrent Modulation in Josephson Junctions With Ni-Based Barriers

May 15, 2018
Author(s)
Burm Baek, Michael L. Schneider, Matthew R. Pufall, William H. Rippard
We investigate the supercurrent transport characteristics of Ni-barrier Josephson junctions with various barrier multilayer structures. Our device fabrication and magneto-electrical measurement methods provide high enough statistics and rigor necessary for

Giant Negative Thermal Expansion in Bonded MnCoGe-Based Compounds with Ni 2 In-Type Hexagonal Structure

February 11, 2015
Author(s)
Ying-Ying Zhao, Feng-Xia Hu, Li-Fu Bao, Jing Wang, Hui Wu, Qingzhen Huang, Rong-Rong Wu, Yao Liu, Fei-Ran Shen, Hao Kuang, Ming Zhang, Wen-Liang Zuo, Xin-Qi Zheng, Ji-Rong Sun, Bao-Gen Shen
MnCoGe-based compounds undergo a large negative thermal expansion (NTE) during the martensitic structural transition from Ni 2In-type hexagonal to TiNiSi-type orthorhombic structure. High resolution neutron diffraction experiments revealed that the

Evaluating the locality of intrinsic precession damping in transition metals

April 24, 2009
Author(s)
Keith Gilmore, Mark D. Stiles
The Landau-Lifshitz-Gilbert damping parameter is typically assumed to be a local quantity, independent of the magnetic configuration. To test the validity of this assumption we calculate the precession damping rate of small amplitude non-uniform mode

New reference standards and artifacts for nanoscale physical property characterization

July 1, 2006
Author(s)
Jon R. Pratt, John A. Kramar, Gordon Shaw, Richard Gates, Paul Rice, John M. Moreland
This paper provides an overview of calibration artifacts being developed at the National Institute of Standards and Technology (NIST) that are intended to aid the accurate determination of nanoscale physical properties across a broad range of applications

New Reference Standards and Artifacts for Nanoscale Physical Property Characterization

January 1, 2006
Author(s)
Jon R. Pratt, John A. Kramar, Gordon A. Shaw, Richard S. Gates, Paul Rice, John M. Moreland
This paper provides an overview of calibration artifacts being developed at the National Institute of Standards and Technology (NIST) that are intended to aid the accurate determination of nanoscale physical properties across a broad range of applications

Elastic and Inelastic Collisions of Cold Spin-Polarized 133 Cs Atoms

August 17, 1998
Author(s)
P J. Leo, Eite Tiesinga, Paul S. Julienne, T G. Walker
We present theoretical calculations of thermally averaged elastic cross sections and spin relaxation rates in the temperature range 1 {micro}K to 300 {micro}K for magnetically trapped doubly polarized Cesium atoms. The calculations reproduce the recent

A Low-Power, High-Sensitivity Micromachined Optical Magnetometer

December 11, 2012
Author(s)
Rahul R. Mhaskar, Svenja A. Knappe, John E. Kitching
We demonstrate a fiber-optically coupled optical magnetometer based on a microfabricated 87Rb vapor cell in a micromachined silicon sensor head. The cell is optically heated with light at 1.5 mm brought to the cell through an optical fiber and absorbed by

Versatile laser-free trapped-ion entangling gates

March 28, 2019
Author(s)
R. T. Sutherland, Raghavendra Srinivas, Shaun C. Burd, Dietrich Leibfried, Andrew C. Wilson, David J. Wineland, David T. Allcock, Daniel Slichter, S. B. Libby
We present a general theory for laser-free entangling gates with trapped-ion hyperfine qubits, using either static or oscillating magnetic-field gradients combined with a pair of uniform microwave fields symmetrically detuned about the qubit frequency. By

Stochastic Modeling and Simulation of Marginally Trapped Neutrons

May 20, 2014
Author(s)
Kevin J. Coakley
For a magnetic trapping experiment, I present an efficient method for simulating experimental beta −decay rates which accounts for loss of marginally trapped neutrons due to wall collisions and other possible loss mechanisms. Monte Carlo estimates of time

Making Cold Molecules by Time-Dependent Feshbach Resonances

August 1, 2004
Author(s)
Paul S. Julienne, Eite Tiesinga, T Kohler
Pairs of trapped atoms can be associated to make a diatomic molecule using a time dependentMagnetic field to ramp the energy of a scattering resonance state from above to below the scatteringthreshold. A relatively simple model, parameterized in terms of
Displaying 1426 - 1450 of 3361
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