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Displaying 2601 - 2625 of 3362

MSEL FY 2001 Programs and Accomplishments: Metallurgy Division

September 1, 2001
Author(s)
C A. Handwerker, Frank W. Gayle, Richard E. Ricker
This report describes major programs and accomplishments of the Metallurgy Division of the NIST Materials Science and Engineering Laboratory (MSEL) in FY2001 The mission of the NIST Metallurgy Division is to provide critical leadership in the development

Calculation of Spin-Dependent Interface Resistance

January 1, 2000
Author(s)
Mark D. Stiles, David R. Penn
A simple expression for the interface resistance between two materials has been derived by Schep et al. [J. Magn. Magn. Mater. 177, 1166 (1998).] in terms of the transmission probability for electrons at the interface. This approximation is tested for a

Beyond Single Tetrahedron Physics of the Breathing Pyrochlore Compound Ba 3 Yb 2 Zn 5 O 11

April 20, 2023
Author(s)
Rabindranath Bag, Sachith Dissanayake, Han Yan, Zhenzhong Shi, David Graf, Eun S. Choi, Casey Marjerrison, Franz Lang, Tom Lancaster, Yiming Qiu, Wangchun Chen, Stephen J. Blundell, Andriy H. Nevidomskyy, Sara Haravifard
Recently a new class of quantum magnets, the so-called breathing pyrochlore systems, have attracted much attention due to their potential to host exotic emergent phenomena. Here, we present magnetometry, thermal, muon-spin relaxation, and polarized

Thermal Limits on Field Alignment of Nanoparticle FePt Media

October 12, 2021
Author(s)
J A. Bain, William F. Egelhoff Jr.
We derive a simple expression for the angular distribution of ferromagnetic FePt particles an applied field in thermal equilibrium. This system is closely related to the Langevin expression for paramagnetic susceptibility, which computes the average

Freezing of a Disorder Induced Spin Liquid with Strong Quantum Fluctuations

June 29, 2021
Author(s)
Xiao Hu, Daniel M. Pajerowski, Depei Zhang, Andrey Podlesnyak, Yiming Qiu, Qing Huang, Haidong Zhou, Israel Klich, Alexander I. Kolesnikov, M. B. Stone, Seung-Hun Lee
… Sr 2 CuTe 0.5 W 0.5 O 6 is a square-lattice magnet with super-exchange between S = 1/2 Cu 2+ spins …

Valence Instability Across the Magnetostructural Transition in USb 2

February 14, 2020
Author(s)
Z. E. Brubaker, Y. Xiao, P. Chow, C. Kenney-Benson, J. S. Smith, H. Cynn, C. Reynolds, Nicholas Butch, R. J. Zieve, J. R. Jeffries
We have performed pressure dependent X-ray diffraction and resonant X-ray emission spectroscopy experiments on USb 2 to further characterize the AFM-FM transition occuring near 8 GPa. We have found the magnetic transition coincides with a tetragonal to

Crystallography of Functional Materials (Editorial Comments)

November 15, 2017
Author(s)
Winnie K. Wong-Ng, Claudia J. Rawn
The goal of this special issue is to obtain new insights into the roles of crystallography in functional materials. This special issue consists of eight chapters illustrating the structure and property relationships, as well as applications of selected

Quantum Critical Point in the Sc-Doped Itinerant Antiferromagnet TiAu

June 14, 2017
Author(s)
E. Svanidze, T. Besara, J. K. Wang, D. Geiger, L. Prochaska, J. M. Santiago, Jeffrey W. Lynn, S. Paschen, E. Morosan
We present the first experimental realization of a quantum critical point in an itinerant antiferromagnetic realization of a quantum critical point in an intinerant antiferromagnet composed of non-magnetic constituents, TiAu. By partially substituting Ti

Demonstration of a dressed-state phase gate for trapped ions

June 28, 2013
Author(s)
Ting Rei Tan, John P. Gaebler, Ryan S. Bowler, Yiheng Lin, John D. Jost, Dietrich G. Leibfried, David J. Wineland
We demonstrate a trapped ion entangling gate scheme proposed by Bermudez et~al [Phys. Rev. A 85, 040302 (2012)]. Simultaneous excitation of a strong carrier and a single sideband transition enables deterministic creation of entangled states. The method

Spatial separation in a thermal mixture of ultracold174Yb and 87Rb atoms

April 21, 2011
Author(s)
F. Baumer, F. Munchow, A. Gorlitz, Stephen Maxwell, Paul S. Julienne, Eite Tiesinga
We report on the observation of unusually strong interactions in a thermal mixture of ultracold atoms which cause a significant modification of the spatial distribution. A mixture of 87Rb and 174Yb with a temperature of a few μK is prepared in a hybrid

Evidence that the reversible strain effect on critical current density and flux pinning in Bi2Sr2Ca2Cu3Ox tapes is caused entirely by the pressure dependence of the critical temperature

December 23, 2010
Author(s)
Daniel C. van der Laan, J. F. Douglas, Cameron C. Clickner, Theodore C. Stauffer, Loren F. Goodrich, Hans J. van Eck
It is well known that the critical temperature of cuprate- and iron-based high-temperature superconductors changes with pressure. YBa 2Cu 3O 7-δ coated conductors, as well as Bi 2Sr 2CaCu 2O x and Bi 2Sr 2Ca 2Cu 3O x tapes and wires, show a clear

Microencapsulated POSS in Cellulose Using 1-Ethyl-3-Methylimidazolium Acetate

October 10, 2010
Author(s)
Douglas M. Fox, Mauro Zammarano, Jeffrey W. Gilman
Polyhedral oligomeric silsesquioxane (POSS) and cellulose were reacted in the ionic liquid, 1-ethyl-3-methylimidazolium acetate (EmiAc). Side reactions between the EmiAc and each reactant were prevalent, but use of water as the coagulating solvent produced

Avoided crossings between bound states of ultracold Cesium dimers

November 5, 2008
Author(s)
Jeremy M. Hutson, Eite Tiesinga, Paul S. Julienne
We present a new computational method for calculating bound states of ultracold alkali metal dimers in the presence of magnetic fields. The new method is based on propagation of coupled differential equations and does not use a basis set for the

Frequency-Tunable Josephson Junction Resonator for Quantum Computing

June 23, 2007
Author(s)
Kevin Osborn, Joshua Strong, Adam J. Sirois, Raymond W. Simmonds
We have fabricated and measured a high-Q Josephson junction resonator with a tunable resonance frequency. A dc magnetic flux allows the resonance frequency to be changed by over 10%. Weak coupling to the environment allows a quality factor of 7000 in the

Experimental Techniques for Low-Temperature Measurements

October 1, 2006
Author(s)
John (Jack) W. Ekin
This textbook is written for the experimentalist starting in the laboratory -- beginning graduate students, industry measurement engineers, and materials scientists interested in learning how to design successful low-temperature (1 K to 300 K) measurement

Microfabricated Atomic Clocks and Magnetometers

August 1, 2005
Author(s)
Svenja A. Knappe, P Schwindt, Vladislav Gerginov, V Shah, Hugh Robinson
We describe recent research at NIST directed towards the development of microfabricated atomic clocks and magnetometers based on coherent population trapping spectroscopy. Clock physics packages based on the D1 transition in 87Rb achieve a fractional

Spontaneous Dissociation of Long-Range Feshbach Molecules

January 1, 2005
Author(s)
T K hler, Eite Tiesinga, Paul S. Julienne
We study the spontaneous dissociation of diatomic molecules produced in cold atomic gases via magnetic field tunable Feshbach resonances. We provide a universal formula for the lifetime of these molecules that relates their decay to the scattering length

Resistance Changes Similar to Ballistic Magnetoresistance in Electrodeposited Nanocontacts

January 1, 2004
Author(s)
J Mallett, Erik B. Svedberg, H Ettedgui, Thomas P. Moffat, Alexander J. Shapiro, P J. Chen, L Gan
We have devloped an electrochemical system to allow the resistance of two metal microelectrodes grown to contact to be established and maintained automatically. A thin-film geometry was used for the microelectrodes to suppress the magnetoresistive artifact

Surface and Interface Effects in the Growth of Giant Magnetoresistance Spin Valves for Ultrahigh-Density Data-Storage Applications

August 1, 2001
Author(s)
William F. Egelhoff Jr., P J. Chen, Cedric J. Powell, Robert D. McMichael, Mark D. Stiles
The current generation of hard disk drives use Giant Magnetoresistance (GMR) spin valves as the read-head because the GMR effect is currently the most sensitive way to detect magnetic fields at submicron length scales and data rates of {approximately equal

Surface and interface effects in the growth of giant magnetoresistance spin valves for ultrahigh-density data-storage applications

January 1, 2001
Author(s)
William F. Egelhoff Jr., P J. Chen, Cedric J. Powell, Robert McMichael, Mark D. Stiles
The current generation of hard disk drives use Giant Magnetoresistance (GMR) spin valves as the read-head because the GMR effect is currently the most sensitive way to detect magnetic fields at submicron length scales and data rates of approximately equal}
Displaying 2601 - 2625 of 3362
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