scholarly journals Current-driven skyrmion dynamics in disordered films

2017 ◽  
Vol 110 (13) ◽  
pp. 132404 ◽  
Author(s):  
Joo-Von Kim ◽  
Myoung-Woo Yoo
Keyword(s):  
Disordered Films

Growth and Characterization of Fept Compound thin Films

1995 ◽  
Vol 384 ◽  
Author(s):  
M.R. Visokay ◽  
R. Sinclair
Keyword(s):  
Epitaxial Films ◽  
Orientation Dependence ◽  
Kerr Rotation ◽  
Fept Alloy ◽  
Disordered Alloys ◽  
Disordered Films ◽  
Out Of Plane ◽  
Temperature Deposition ◽  
Fcc Alloys

ABSTRACTFePt alloy films were deposited at 50 and 49°C onto amorphous SiO2 and single crystal [001] MgO and [0001] Al2O3 using DC magnetron cosputtering, resulting in polycrystalline and [001] and [111] epitaxial films, respectively. High temperature deposition resulted in ordered films with the tetragonal Ll structure and out-of-plane magnetic easy axes while low temperature deposition yielded chemically disordered fcc alloys with in-plane easy axes. Significant modification of the magneto-optic Kerr spectrum is observed for ordered relative to disordered alloys for all orientations. The Kerr rotation has a strong orientation dependence for the ordered, but not disordered films.

Electrical Injection and Transport in Films of Semiconductor Nanocrystals

1999 ◽  
Vol 571 ◽  
Author(s):  
D.S. Ginger ◽  
N.C. Greenham
Keyword(s):  
Semiconductor Nanocrystals ◽  
Cdse Nanocrystals ◽  
Temperature Dependent ◽  
Metal Electrodes ◽  
Current Voltage ◽  
Disordered Films ◽  
Effective Mobility ◽  
Current Voltage Characteristics ◽  
Space Charge Limited Currents ◽  
Effective Carrier

ABSTRACTWe study injection and transport in thin disordered films of CdSe nanocrystals between metal electrodes, We investigate the current-voltage characteristics of these devices as a function of electrode material, nanocrystal size, and temperature. We also measure the photocurrent response of these devices, and find that the photocurrent action spectra follow the quantum-confined absorption spectra of the nanocrystals. For dissimilar top and bottom electrodes, we find that the devices are highly rectifying. By studying space charge limited currents in these devices, we are able to place a lower bound on the effective carrier mobility in such films, and we find that the effective mobility is strongly field dependent. We find that the conductivity is strongly temperature dependent, and is qualitatively consistent with an activated hopping process at temperatures above 180 K.

Transport phenomena and model for localized gap states of structure-disordered films on the basis of germanium telluride

1994 ◽  
Vol 143 (2) ◽  
pp. 353-359 ◽  
Author(s):  
S. V. Makarenko ◽  
I. S. Dutsyak ◽  
O. G. Mikolaychuk ◽  
A. Z. Pavlyshyn
Keyword(s):  
Transport Phenomena ◽  
Germanium Telluride ◽  
Disordered Films ◽  
Gap States

SUPERCONDUCTOR-INSULATOR TRANSITIONS

2010 ◽  
Vol 24 (20n21) ◽  
pp. 4081-4101 ◽  
Author(s):  
A. M. Goldman
Keyword(s):  
Phase Transitions ◽  
Quantum Phase Transitions ◽  
Research Area ◽  
Insulator Transition ◽  
Quantum Phase ◽  
External Parameter ◽  
Open Questions ◽  
Disordered Films ◽  
Quantum Critical Behavior ◽  
Superconductor Insulator Transition

Superconductor-insulator transitions, especially in thin films, can provide the simplest examples of the continuous quantum phase transition paradigm. Quantum phase transitions differ from thermal phase transitions in that they occur at zero temperature when the ground state of a system is changed in response to a variation of an external parameter of the Hamiltonian. In the example of the superconductor-insulator transition, this control parameter could be the parallel or perpendicular magnetic field, disorder, or charge density. Quantum phase transitions are studied through measurements at nonzero temperature of physical behaviors influenced by the quantum fluctuations associated with the transition. This review will focus on experimental aspects of superconductor-insulator transition in disordered films that are effectively two-dimensional. In particular, the evidence for quantum critical behavior in the various types of transitions will be presented. The various theoretical scenarios for the transitions will also be discussed along with the extent to which they are supported by experiment. Open questions relating to the nature of the very puzzling insulating regime and whether there are many different types of superconductor-insulator transitions will be presented. Although this research area is more than 20 years old, rather central issues are not resolved.

Thermoelectricity of disordered films near the metal–non-metal transition

1999 ◽  
Vol 250-252 ◽  
pp. 791-794 ◽  
Author(s):  
C Lauinger ◽  
T Hunger ◽  
J Barzola-Quiquia ◽  
P Häussler ◽  
H.-G Boyen
Keyword(s):  
Disordered Films

scholarly journals Granular metal–carbon nanocomposites as piezoresistive sensor films – Part 2: Modeling longitudinal and transverse strain sensitivity

2018 ◽  
Vol 7 (1) ◽  
pp. 69-78 ◽  
Author(s):  
Silvan Schwebke ◽  
Ulf Werner ◽  
Günter Schultes
Keyword(s):  
Electron Transport ◽  
Large Strain ◽  
Local Strain ◽  
Carbon Matrix ◽  
Morphological Characterization ◽  
Transverse Strain ◽  
Strain Sensitivity ◽  
Sensor Material ◽  
Piezoresistive Sensor ◽  
Disordered Films

Abstract. Granular and columnar nickel–carbon composites may exhibit large strain sensitivity, which makes them an interesting sensor material. Based on experimental results and morphological characterization of the material, we develop a model of the electron transport in the film and use it to explain its piezoresistive effect. First we describe a model for the electron transport from particle to particle. The model is then applied in Monte Carlo simulations of the resistance and strain properties of the disordered films that give a first explanation of film properties. The simulations give insights into the origin of the transverse sensitivity and show the influence of various parameters such as particle separation and geometric disorder. An important influence towards larger strain sensitivity is local strain enhancement due to different elastic moduli of metal particles and carbon matrix.

scholarly journals Chlorosubstituted Copper Phthalocyanines: Spectral Study and Structure of Thin Films

Molecules ◽  
2020 ◽  
Vol 25 (7) ◽  
pp. 1620 ◽  
Author(s):  
Alexandr Sukhikh ◽  
Dmitry Bonegardt ◽  
Darya Klyamer ◽  
Pavel Krasnov ◽  
Tamara Basova
Keyword(s):  
Thin Films ◽  
Raman Spectroscopy ◽  
Substrate Surface ◽  
X Ray Diffraction ◽  
Amorphous Films ◽  
X Ray ◽  
Disordered Films ◽  
Copper Phthalocyanines ◽  
First Time ◽  
Ir And Raman

In this work, the tetra-, octa- and hexadecachloro-substituted copper phthalocyanines CuPcClx (where x can equal 4, 8 or 16) were investigated by the methods of vibrational (IR and Raman) spectroscopy and X-ray diffraction. The assignment of the most intense bands, both in IR and Raman spectra, was carried out on the basis of DFT calculations. The structure of a CuPcCl4 single crystal grown by sublimation in vacuum was refined for the first time. The effect of chloro-substitution on the structure of CuPcClx thin films deposited in a vacuum onto a glass substrate at 50 and 200 °C was studied. It was shown that CuPcCl4 formed polycrystalline films with the preferential orientation of the (100) crystallographic plane of crystallites parallel to the substrate surface when deposited on a substrate at 50 °C. Introduction of more Cl-substituents into the phthalocyanine macrocycle leads to the formation of amorphous films on the substrates at 50 °C. At the elevated substrate temperature, the growth of polycrystalline disordered films was observed for all three copper phthalocyanines.

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