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Physics

Condensed matter

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Displaying 751 - 775 of 1242

Advances in RRAM technology: identifying and mitigating roadblocks

January 13, 2017
Author(s)
Dmitry Veksler, Gennadi Bersuker
The filament-based RRAM has demonstrated superior scalability, endurance, low power operation, retention, and operating speed. A challenge navigating trade-offs between high density, low switching power, and stability can be addressed by capitalizing on

Tricritical Point of the f-Electron Antiferromagnet USb 2 Driven by High Magnetic Fields

January 12, 2017
Author(s)
Ryan L. Stillwell, I Lin NMN Liu, N. Harrison, M. Jaime, J. R. Jeffries, Nicholas Butch
In pulsed magnetic fields up to 65T and at temperatures below the Neel transition, our magnetization and magnetostriction measurements reveal a field-induced metamagnetic-like transition that is suggestive of an antiferromagnetic to polarized paramagnetic

Gapped Excitation in Dense Kondo Lattice CePtZn

January 10, 2017
Author(s)
Leland Weldon Harriger, Steven M.T. Disseler, J. Gunasekera, Jose A. Rodriguez, J. Pixley, P. Manfrinetti, S. K. Dhar, D. K. Singh
We report on neutron υSR scattering studies of dense Kondo lattice CePtZn. The system develops long range incommensurate magnetic order as the temperature is reduced below T N = 1.75 K. Interesting, a Q-indpenedent characteristic and its persistence to

Extrapolative Scaling Expression: A Fitting Equation for Extrapolating Full Ic(B,T,e) Data Matrixes from Limited Data

January 4, 2017
Author(s)
John (Jack) W. Ekin, Najib Cheggour, Loren F. Goodrich, Jolene D. Splett, Bernardo Bordini, David Richter, Luca Bottura
Scaling analysis of several thousand Nb3Sn critical-current (Ic) measurements is used to derive the extrapolative scaling expression (ESE), a global fitting equation that can quickly and accurately extrapolate (or interpolate) limited datasets to obtain

Tailoring Exchange Couplings in Magnetic Topological Insulator/Antiferromagnet Heterostructures

January 1, 2017
Author(s)
Qing Lin He, Xufeng Kou, Alexander Grutter, Gen Yin, Lei Pan, Xiaoyu Che, Yuxiang Liu, Tianxiao Nie, Bin Zhang, Steven M.T. Disseler, Brian Kirby, William D. Ratcliff, Qiming Shao, Koichi Murata, Xiaodan Zhu, Guoqiang Yu, Yabin Fan, Mohammad Montazeri, Xiaodong Han, Julie Borchers, Kang L. Wang
Magnetic topological insulators such as Cr-doped (Bi,Sb) 2Te 3 provide a platform for the realization of versatile time-reversal symmetry-breaking physics. By constructing heterostructures with the unique Neel order in an antiferromagnetic CrSb and the

Stoner vs. Heisenberg: Ultrafast exchange reduction and magnon generation during laser-induced demagnetization

December 28, 2016
Author(s)
Thomas J. Silva, Hans T. Nembach, Justin M. Shaw, Emrah Turgut, Dmitriy Zusin, Dominik Legut, Karel Carva, Ronny Knut, Cong Chen, Zhensheng Tao, Stefan Mathias, Martin Aeschlimann, Peter Oppeneer, Henry Kapteyn, Margaret Murnane, Patrik Grychtol
Understanding how the electronic band structure of a ferromagnetic material is modified during laser-induced demagnetization on femtosecond timescales has been a long-standing question in condensed matter physics. Here, we use ultrafast high harmonics to

Magnetization Reversal of Three-Dimensional Nickel Anti-Sphere Arrays

December 23, 2016
Author(s)
Le Yu, Zhongying Yan, Han-Chang Yang, Xuzhao Chai, Bingqing Li, Sina Moeendarbari, Yaowu Hao, Di Zhang, Gang Feng, Ping Han, Dustin A. Gilbert, Kai Liu, Kristen S. Buchanan, Xuemei Cheng
Three-dimensional anti-sphere arrays (3DAAs) of Ni have been fabricated using electrochemical deposition into self-assembled polystyrene sphere templates, which offers the advantage of straightforward scalability. Using the first-order reversal curve (FORC

Identification of the Low-Energy Excitations in a Quantum Critical System

December 20, 2016
Author(s)
Tom Heitmann, Jagat Lamsal, Shannon M. Watson, Ross Erwin, Wangchun Chen, Yang Zhao, Wouter Montfrooij
We have identified low-energy magnetic excitations in a doped quantum critical system by means of polarized neutron scattering experiments. The presence of these excitations could explain why Cd(Fe 0.76Ru 0.24) 2Ge 2 displays dynamical scaling in the

Atomically precise device fabrication

December 7, 2016
Author(s)
Joseph A. Hagmann, Xiqiao Wang, Pradeep N. Namboodiri, Richard M. Silver, Curt A. Richter
An improved capacity to control matter at the atomic scale is central to the advancement of nanotechnology. The complementary metal-oxide-semiconductor (CMOS) devices that power existing computing technology, which continue to scale down in size as

Large Anomalous Hall Effect in a Half-Heusler Antiferromagnet

December 1, 2016
Author(s)
T. Suzuki, Robin Michael Daub Chisnell, A. Devarakonda, Y.-T. Liu, W. Feng, D. Xiao, Jeffrey W. Lynn, J. G. Checkelsky
The quantum mechanical (Berry) phase of the electronic wavefunction has profound effects on spin-dependent behavior in solids [2,2]. In the context of electronic transport, the Berry phase plays a critical role as a fundamental origin of the anomalous [3,4

Membrane-Based Environmental Cells for SEM in Liquids

December 1, 2016
Author(s)
Andrei A. Kolmakov
Environmental electron microscopy and Scanning Electron Microscopy (SEM) in liquids are among the most active research areas in modern electron microscopy and spectroscopy. Research interest in these techniques is broad as they are enabling the nanoscale

Intermediate Regime between Metal and Superconductor Below T = 100 K in NiSi

November 28, 2016
Author(s)
Ashutosh Dahal, Jagath Gunasekera, Leland Harriger, S. H. Lee, Y. S. Hor, David J. Singh, Deepak K. Singh
Magnetic response of a metal to an external magnetic field is termed as paramagnetic or diamagnetic, depending on the parallel or antiparallel alignment of electron's moment to the applied field, respectively. 1-3 It remains independent of temperature of

Oscillatory Non-Collinear Magnetism Induced by Interfacial Charge Transfer in Metallic Oxide Superlattices

November 22, 2016
Author(s)
Jason D. Hoffman, Brian Kirby, Jihwan Kwon, Gilberto Fabbris, John W. Freeland, Ivar Martin, Olle G. Heinonen, Paul Steadman, Hua Zhou, Christian M. Schleputz, Suzanne G. E. te Velthuis, Jian-Min Zuo, Anand Bhattacharya
Interfaces between correlated complex oxides are promising avenues to realize new forms of magnetism that arise as a result of charge transfer, proximity effects and locally broken symmetries. We report upon the discovery of a non-collinear magnetic

Unified scaling law for flux pinning in practical superconductors: Part 2. Parameter testing, scaling constants, and the extrapolative scaling expression

November 17, 2016
Author(s)
John (Jack) W. Ekin, Najib Cheggour, Loren F. Goodrich, Jolene D. Splett, Bernardo Bordini, David Richter
A scaling study of several thousand Nb3Sn critical-current (Ic) measurements is used to derive the extrapolative scaling expression (ESE), a relation that can quickly and accurately interpolate and extrapolate full three-dimensional Ic(B,T,ε) datasets from

Fragile Morphotropic Phase Boundary and Phase Stability in the Near-Surface Region of Relaxor Ferroelectric (1-x)Pb(Zn 1/3 Nb 2/3 )O 3-x PbTiO 3 : [001] Field-Cooled Phase Diagrams

November 10, 2016
Author(s)
Yaojin Wang, Ding Wang, Guoliang Yuan, He Ma, Feng Xu, Jiefang Li, D. Viehland, Peter M. Gehring
We have examined the effects of field cooling on the phase diagram of the relaxor system (1-X)Pb(Zn 1/3Nb 2/3)O6d3-x^PbTiO 3 (PZN-xPT) for compositions near the morphotropic phase boundary (MPB). High-resolution diffraction measurements using CuK αx-rays

Circular Photogalvanic Effect in Organometal Halide Perovskite CH3NH3PbI3

November 7, 2016
Author(s)
Junwen Li, Paul M. Haney
We study the circular photogalvanic effect in the organometal halide perovskite solar cell absorber CH$_3$NH$_3$PbI$_3$. The calculated photocurrent density is about $10^{-9}$ A/W, comparable to the previously studied quantum well and bulk Rashba systems

Calibration of Effective Tunneling Bandgap in GaAsSb/InGaAs for improved TFET Performance Prediction

November 3, 2016
Author(s)
Quentin Smets, Anne S. Verhulst, Salim El Kazzi, David J. Gundlach, Curt A. Richter, Anda Mocuta, Nadine Collaert, Aaron Thean, Marc Heyns
The effective bandgap for heterojunction band-to-band tunneling (Eg,eff) is a crucial design parameter for heterojunction TFET. However, there is significant uncertainty on Eg,eff, especially for In0.53Ga0.47As/GaAs0.5Sb0.5. This makes TFET performance

Perpendicular magnetic anisotropy of two-dimensional Rashba ferromagnets

November 3, 2016
Author(s)
Kyoung-Whan Kim, Kyung Jin Lee, Hyun-Woo Lee, Mark D. Stiles
We compute the magnetocrystalline anisotropy energy within two-dimensional Rashba models. For a free- electron Rashba model with infinite band width and infinite Brillouin zone, the anisotropy is exactly zero no matter how strong the Rashba coupling is

Origin and Reduction of 1=f Magnetic Flux Noise in Superconducting Devices

October 18, 2016
Author(s)
P Kumar, David P. Pappas, Robert Mcdermott, J.W. Freeland, Clare Yu, M Beck, Hui Wang, Ruqian Wu
Magnetic flux noise is a dominant source of dephasing and energy relaxation in superconducting qubits. The noise power spectral density varies with frequency as 1=f^α, with α ≲ 1, and spans 13 orders of magnitude. Recent work indicates that the noise is

Magnetic microscopy and simulation of strain-mediated control of magnetization in Ni/PMN-PT nanostructures

October 17, 2016
Author(s)
Ian J. Gilbert, Andres C. Chavez, Daniel T. Pierce, John Unguris, Wei-Yang Sun, Cheng-Yen Liang, Gregory P. Carman
Strain-mediated thin film multiferroics comprising piezoelectric/ferromagnetic heterostructures enable the electrical manipulation of magnetization with much greater efficiency than other methods; however, the investigation of nanostructures fabricated

Non-equilibrium Transport of Light

October 16, 2016
Author(s)
Jacob M. Taylor, Chiao-Hsuan Wang
Understanding the behavior of light in non-equilibrium scenarios underpins much of quantum optics and optical physics. While lasers provide a severe example of a non-equilibrium problem, recent interests in the near-equilibrium physics of photon `gases'
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