Effects Of Structural And Electronic Disorder In Topological Insulator Sb2te3 Thin Films,
2018
CUNY Graduate Center
Effects Of Structural And Electronic Disorder In Topological Insulator Sb2te3 Thin Films, Inna Korzhovska
Dissertations, Theses, and Capstone Projects
Topological quantum matter is a unique and potentially transformative protectorate against disorder-induced backscattering. The ultimate disorder limits to the topological state, however, are still not known - understanding these limits is critical to potential applications in the fields of spintronics and information processing. In topological insulators spin-orbit interaction and time-reversal-symmetry invariance guarantees - at least up to a certain disorder strength - that charge transport through 2D gapless Dirac surface states is robust against backscattering by non-magnetic disorder. Strong disorder may destroy topological protection and gap out Dirac surface states, although recent theories predict that under severe electronic disorder a …
Time-Evolved Constant Voltage Conductivity Measurements Of Common Spaceborne Polymeric Materials,
2018
Utah State University
Time-Evolved Constant Voltage Conductivity Measurements Of Common Spaceborne Polymeric Materials, Brian Wood, David King, Jr Dennison
Presentations
No abstract provided.
Mutual Influence Between Macrospin Reversal Order And Spin-Wave Dynamics In Isolated Artificial Spin-Ice Vertices,
2018
Università di Ferrara, Italy
Mutual Influence Between Macrospin Reversal Order And Spin-Wave Dynamics In Isolated Artificial Spin-Ice Vertices, F. Montoncello, L. Giovannini, Wonbae Bang, J. B. Ketterson, M. B. Jungfleisch, A. Hoffmann, Barry W. Farmer, Lance E. De Long
Physics and Astronomy Faculty Publications
We theoretically and experimentally investigate magnetization reversal and associated spin-wave dynamics of isolated threefold vertices that constitute a Kagome lattice. The three permalloy macrospins making up the vertex have an elliptical cross section and a uniform thickness. We study the dc magnetization curve and the frequency versus field curves (dispersions) of those spin-wave modes that produce the largest response. We also investigate each macrospin reversal from a dynamic perspective, by performing micromagnetic simulations of the reversal processes, and revealing their relationships to the soft-mode profile calculated at the equilibrium state immediately before reversal. The theoretical results are compared with the …
Sensor Design For In-Flight Testing Of Small-Satellite Thruster,
2018
Utah State University
Sensor Design For In-Flight Testing Of Small-Satellite Thruster, Alex Souvall
Senior Theses and Projects
No abstract provided.
Structure And Magnetism Of Mn5ge3 Nanoparticles,
2018
University of Delaware
Structure And Magnetism Of Mn5ge3 Nanoparticles, Onur Tosun, Mohammed Salehi-Fashami, Balamurugan Balasubramanian, Ralph Skomski, David J. Sellmyer, George C. Hadjipanayis
Nebraska Center for Materials and Nanoscience: Faculty Publications
In this work, we investigated the magnetic and structural properties of isolated Mn5Ge3 nanoparticles prepared by the cluster-beam deposition technique. Particles with sizes between 7.2 and 12.6 nm were produced by varying the argon pressure and power in the cluster gun. X-ray diffraction (XRD)and selected area diffraction (SAD) measurements show that the nanoparticles crystallize in the hexagonal Mn5Si3-type crystal structure, which is also the structure of bulk Mn5Ge3. The temperature dependence of the magnetization shows that the as-made particles are ferromagnetic at room temperature and have slightly different Curie …
Structural, Magnetic, And Electron-Transport Properties Of Epitaxial Mn2Ptsn Films,
2018
University of Nebraska-Lincoln
Structural, Magnetic, And Electron-Transport Properties Of Epitaxial Mn2Ptsn Films, Y. Jin, Shah R. Valloppilly, Parashu Kharel, Jace Waybright, Pavel V. Lukashev, Xingzhong Li, David J. Sellmyer
Nebraska Center for Materials and Nanoscience: Faculty Publications
The growth of new magnetic materials on suitable insulating substrates is an important part of the development of spin-electronics devices for memory or information processing. Epitaxial thin films of Mn2PtSn were grown on a MgO [001] substrate by magnetron co-sputtering of the constituents. Structural, magnetic, and electron-transport properties were investigated. The epitaxial Mn2PtSn film has an inverse tetragonal structure with the c-axis aligned in the plane of the MgO substrate. The lattice constants determined using XRD and TEM analysis are c=6.124Å and a=b=4.505Å. The orientation of Mn2PtSn c-axis which …
Multi-Walled Carbon Nanotube-Coated Spiral Coils For Loss Reduction In Wireless Power
Transfer Systems,
2018
University of Nebraska-Lincoln
Multi-Walled Carbon Nanotube-Coated Spiral Coils For Loss Reduction In Wireless Power Transfer Systems, Kamran Keramatnejad, Dawei Li, Hossein Rabiee Golgir, Loic Constantin, Xi Huang, Qiming Zou, Jean-Francois Silvain, Stephen Ducharme, Yongfeng Lu
Stephen Ducharme Publications
Realization of high efficiency and long transmission range in high-frequency wireless power transfer (WPT) systems has always been hindered by the increased resistance due to the eddy current loss occurring in the inductive coils. In this study, multi-walled carbon nanotube-coated copper (MWCNT-Cu) coils are successfully introduced to address this limitation by implementing the frequency-inert MWCNT channels along with using their high-surface areas to realize the electromagnetic shielding of the Cu substrate through multiple reflection mechanisms. At a frequency of 15 MHz, the resistance of the individual MWCNT-Cu coil was reduced to less than 40% of its original value for primitive …
Parameterization Of Secondary And Backscattered Electron Yields For Spacecraft Charging,
2018
Utah State University
Parameterization Of Secondary And Backscattered Electron Yields For Spacecraft Charging, Justin Christensen, Phil Lundgreen, Jr Dennison
Posters
No abstract provided.
Electron Yield Properties Of Low-Density Polyethylene,
2018
Utah State University
Electron Yield Properties Of Low-Density Polyethylene, Jordan Lee, Jr Dennison
Presentations
No abstract provided.
Electron Yield Of Low-Density Polyethylene,
2018
Utah State University
Electron Yield Of Low-Density Polyethylene, Jordan Lee, Jr Dennison
Presentations
No abstract provided.
Secondary Electron Yield Measurements Of Carbon Nanotube Forests: Dependence On Morphology And Substrate,
2018
Utah State University
Secondary Electron Yield Measurements Of Carbon Nanotube Forests: Dependence On Morphology And Substrate, Brian Wood, Justin Christensen, Gregory Wilson, T. -C. Shen, Jr Dennison
Conference Proceedings
No abstract provided.
Wireless Antenna Detection Of Electrostatic Discharge Events,
2018
Utah State University
Wireless Antenna Detection Of Electrostatic Discharge Events, Allen Andersen, Jr Dennison
Posters
Wireless intra-spacecraft communication systems are being developed due to their potential for weight-saving and design flexibility compared to wired systems. Such systems are essentially an on-board Wi-Fi network allowing various spacecraft systems to communicate wirelessly.
Simulating Muscle Atrophy Due To Microgravity And Ionizing Radiation,
2018
Utah State University
Simulating Muscle Atrophy Due To Microgravity And Ionizing Radiation, Lori Caldwell, Eryn Hanson, Alexandra H. Nelson, Charles Harding, Jr Dennison, Elizabeth Vargis
Presentations
No abstract provided.
A Brief Review Of Ferroelectric Control Of Magnetoresistance In Organic
Spin Valves,
2018
University of Nebraska-Lincoln
A Brief Review Of Ferroelectric Control Of Magnetoresistance In Organic Spin Valves, Xiaoshan Xu
Xiaoshan Xu Papers
Magnetoelectric coupling has been a trending research topic in both organic and inorganic materials and hybrids. The concept of controlling magnetism using an electric field is particularly appealing in energy efficient applications. In this spirit, ferroelectricity has been introduced to organic spin valves to manipulate the magneto transport, where the spin transport through the ferromagnet/organic spacer interfaces (spinterface) are under intensive study. The ferroelectric materials in the organic spin valves provide a knob to vary the interfacial energy alignment and the interfacial crystal structures, both are critical for the spin transport. In this review, we introduce the recent efforts of …
The Promise Of Piezoelectric Polymers,
2018
California State University San Bernardino
The Promise Of Piezoelectric Polymers, Timothy D. Usher, Kimberley R. Cousins, Renwu Zhang, Stephen Ducharme
Stephen Ducharme Publications
Recent advances provide new opportunities in the field of polymer piezoelectric materials. Piezoelectric materials provide unique insights to the fundamental understanding of the solid state. In addition, piezoelectric materials have a wide range of applications, representing billions of dollars of commercial applications. However, inorganic piezoelectric materials have limitations that polymer ferroelectric materials can overcome, if certain challenges can be addressed. This mini-review is a practical summary of the current research and future directions in the investigation and application of piezoelectric materials with an emphasis on polymeric piezoelectric materials. We will assume that the reader is well versed in the subject …
Unsupervised Machine Learning Account Of Magnetic Transitions In The Hubbard Model,
2018
San Jose State University
Unsupervised Machine Learning Account Of Magnetic Transitions In The Hubbard Model, Kelvin Ch'ng, Nick Vazquez, Ehsan Khatami
Faculty Publications
We employ several unsupervised machine learning techniques, including autoencoders, random trees embedding, and t-distributed stochastic neighboring ensemble (t-SNE), to reduce the dimensionality of, and therefore classify, raw (auxiliary) spin configurations generated, through Monte Carlo simulations of small clusters, for the Ising and Fermi-Hubbard models at finite temperatures. Results from a convolutional autoencoder for the three-dimensional Ising model can be shown to produce the magnetization and the susceptibility as a function of temperature with a high degree of accuracy. Quantum fluctuations distort this picture and prevent us from making such connections between the output of the autoencoder and …
Characterizing The Effects Of Radiation On Muscle Cells,
2018
Utah State University
Characterizing The Effects Of Radiation On Muscle Cells, Lori Caldwell, Charles Harding, Eryn Hanson, Jr Dennison, Elizabeth Vargis
Presentations
No abstract provided.
Wireless Antenna Detection Of Electrostatic Discharge Events,
2018
Utah State University
Wireless Antenna Detection Of Electrostatic Discharge Events, Allen Andersen, Jr Dennison
Posters
Wireless intra-spacecraft communication systems are being developed due to their potential for weight-saving and design flexibility compared to wired systems [1,2]. Such systems are essentially an on-board Wi-Fi network allowing various spacecraft systems to communicate wirelessly.
Effects Of Sample Adhesives Acoustic Properties On Spatial Resolution Of Pulsed Electroacoustic Measurements,
2018
Utah State Univesity
Effects Of Sample Adhesives Acoustic Properties On Spatial Resolution Of Pulsed Electroacoustic Measurements, Zachary Gibson, Jr Dennison, Lee Pearson, Erick Griffiths, Anthony Pearson, Virginie Griseri
Conference Proceedings
No abstract provided.
Incorporating Electron Range Approximations Into Secondary Electron Emission Models,
2018
Utah State University
Incorporating Electron Range Approximations Into Secondary Electron Emission Models, Gregory Wilson
Conference Proceedings
No abstract provided.
