In-plane and out-of-plane shape transitions of heteroepitaxially self-assembled nanostructures

2007 ◽  
Vol 601 (13) ◽  
pp. 2756-2761 ◽  
Author(s):  
I. Goldfarb
Keyword(s):  
Out Of Plane ◽  
Plane Shape ◽  
Self Assembled ◽  
Shape Transitions

Improved speckle projection profilometry for out-of-plane shape measurement

2008 ◽  
Vol 47 (29) ◽  
pp. 5527 ◽  
Author(s):  
Bing Pan ◽  
Huimin Xie ◽  
Jianxin Gao ◽  
Anand Asundi
Keyword(s):  
Shape Measurement ◽  
Out Of Plane ◽  
Plane Shape

Interfacial strain driven magnetoelectric coupling in (111)-oriented self-assembled BiFeO3–CoFe2O4 thin films

2020 ◽  
Vol 8 (10) ◽  
pp. 3527-3535 ◽  
Author(s):  
Lei Wang ◽  
Jihong Bian ◽  
Lu Lu ◽  
Zhongshuai Liang ◽  
Dawei Zhang ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetic Fields ◽  
Tensile Strain ◽  
Magnetoelectric Coupling ◽  
Out Of Plane ◽  
Interfacial Strain ◽  
Self Assembled

The piezoelectric amplitude drops by 44.7% and meanwhile the out-of-plane tensile strain rises by 11.0% under reverse magnetic fields in (1–3)-type BFO–CFO thin films.

THICKNESS DEPENDENCE OF THIRD-HARMONIC GENERATION FROM SELF-ASSEMBLED REGIOREGULAR POLY(3-HEXYLTHIOPHENE) THIN FILMS ON QUARTZ GLASSES WITH DIFFERENT SURFACES

2008 ◽  
Vol 17 (04) ◽  
pp. 451-463 ◽  
Author(s):  
XIN WANG ◽  
JIASHENG RU ◽  
SHIZUYASU OCHIAI ◽  
YUU YAMADA ◽  
YOSHIYUKI UCHIDA ◽  
...  
Keyword(s):  
Thin Films ◽  
Visible Absorption ◽  
Force Microscopy ◽  
Glass Substrates ◽  
Atomic Force ◽  
Cast Films ◽  
Regioregular Poly ◽  
Out Of Plane ◽  
Self Assembled ◽  
Quartz Glasses

Regioregular poly(3-hexylthiophene) [RR-P3HT] thin films were prepared on fused quartz glasses by spin-coating and drop-casting from the chloroform solutions. Film structures and morphologies were characterized by UV-visible absorption spectra, out-of-plane X-ray diffraction (XRD) and atomic force microscopy (AFM). Drop-cast films showed increased χ(3) of about three times higher than that of the spin-coated ones when the film thicknesses were both around 140 nm, and the magnitude of the increase was different for different thickness. The magnitudes of χ(3) for drop-cast RR-P3HT films were calculated in the range of 10-11 esu, and the phases of χ(3) lay in the range from 230 to 300° which were consistent with the contributions from two-photon absorptions (TPA). Hexamethyldisilazane (HMDS) treatment of the glass substrates could increase the χ(3) of drop-cast films further from about ten percent to several times higher. This also depended on the film thickness. These results revealed the deposition method and surface modification effects on the self-assembled RR-P3HT film structures, and the importance of higher-ordering and increased crystallinity for the enhancement of the χ(3) of the polymeric films for their applications in NLO devices.

scholarly journals Observation of the Magnetization Reorientation in Self-Assembled Metallic Fe-Silicide Nanowires at Room Temperature by Spin-Polarized Scanning Tunneling Spectromicroscopy

Coatings ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 314
Author(s):  
Ie-Hong Hong ◽  
Sheng-Wen Liu
Keyword(s):  
Room Temperature ◽  
Differential Conductance ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Magnetic Structures ◽  
Spin Polarized ◽  
Out Of Plane ◽  
Magnetic Period ◽  
Self Assembled ◽  
Reduced Density

The quasi-periodic magnetic domains in metallic Fe-silicide nanowires self-assembled on the Si(110)-16 × 2 surface have been observed at room temperature by direct imaging of both the topographic and magnetic structures using spin-polarized scanning tunneling microscopy/spectroscopy. The spin-polarized differential conductance (dI/dV) map of the rectangular-sectional Fe-silicide nanowire with a width and height larger than 36 and 4 nm, respectively, clearly shows an array of almost parallel streak domains that alternate an enhanced (reduced) density of states over in-plane (out-of-plane) magnetized domains with a magnetic period of 5.0 ± 1.0 nm. This heterostructure of magnetic Fe-silicide nanowires epitaxially integrated with the Si(110)-16 × 2 surface will have a significant impact on the development of Si-based spintronic nanodevices.

Off-Axis Electron Holography of Self-Assembled Co Nanoparticle Rings

2007 ◽  
Vol 1026 ◽  
Author(s):  
Takeshi Kasama ◽  
Rafal E. Dunin-Borkowski ◽  
Michael R. Scheinfein ◽  
Steven L. Tripp ◽  
Jie Liu ◽  
...  
Keyword(s):  
Room Temperature ◽  
Phase Image ◽  
Objective Lens ◽  
Electron Holography ◽  
Zero Field ◽  
Transmission Electron ◽  
Out Of Plane ◽  
Self Assembled ◽  
Magnetic States

AbstractWe use off-axis electron holography in the transmission electron microscope (TEM) to study magnetic flux closure (FC) states in self-assembled nanoparticle rings that each contain between five and eleven 25-nm-diameter Co crystals. Electron holograms are acquired at room temperature in zero-field conditions after applying chosen magnetic fields to the samples in situ in the TEM by partially exciting the conventional microscope objective lens. Mean inner potential contributions to the phase shift are determined by turning the samples over, and subsequently subtracted from each recorded phase image to obtain magnetic induction maps. Our results show that most nanoparticle rings form FC remanent magnetic states, and occasionally onion-like states. Although the chiralities (the directions of magnetization) of the FC states are determined by the shapes, sizes and positions of the constituent nanoparticles, reproducible magnetization reversal of each ring can be achieved by using an out-of-plane magnetic field of between 1600 and 2500 Oe.

scholarly journals Self-Assembled BaTiO3-MnZnFe2O4Nanocomposite Films

2012 ◽  
Vol 2012 ◽  
pp. 1-5
Author(s):  
Guo Yu ◽  
Feiming Bai ◽  
Huaiwu Zhang
Keyword(s):  
Remanent Polarization ◽  
Lattice Mismatch ◽  
Nanocomposite Films ◽  
X Ray Diffraction ◽  
Mnzn Ferrite ◽  
Large Lattice ◽  
Out Of Plane ◽  
Large Lattice Mismatch ◽  
Plane Direction ◽  
Self Assembled

Self-assembled nanocomposite BaTiO3-Mn0.4Zn0.87Fe2O4magnetodielectric films have been grown on (001)-oriented SrTiO3substrates by a pulsed laser deposition method. High resolution X-ray diffraction shows that both BaTiO3and MnZn-ferrite phases are epitaxial along the out-of-plane direction with a 0–3 composite structure in spite of very large lattice mismatch. The magnetic, ferroelectric, and dielectric properties of the nanocomposite films are reported. A saturated magnetization of 330 emu/cc and double remanent polarization of 40 μC/cm2were obtained. Structural and compositional factors limiting the effective permeability and the dielectric constant will be discussed.

A new surfactant-fluorescence probe for detecting shape transitions in self-assembled systems

2008 ◽  
Vol 323 (2) ◽  
pp. 420-425 ◽  
Author(s):  
Lining Gao ◽  
Qian Song ◽  
Xi Huang ◽  
Jianbin Huang
Keyword(s):  
Fluorescence Probe ◽  
Self Assembled ◽  
Shape Transitions

Shape Transitions of Self-Assembled Ge Islands on Si(001)

2001 ◽  
Vol 707 ◽  
Author(s):  
Armando Rastelli ◽  
Matthias Kummer ◽  
Hans Von Känel
Keyword(s):  
Substrate Temperature ◽  
Morphological Changes ◽  
Scanning Tunnelling Microscopy ◽  
Scanning Tunnelling ◽  
Tunnelling Microscopy ◽  
Magnetron Sputter ◽  
Self Assembled ◽  
Shape Changes ◽  
Stable Shape ◽  
Shape Transitions

ABSTRACTCoherently strained Ge islands were grown at a substrate temperature of 550°C by magnetron sputter epitaxy on Si (001) and studied by scanning tunnelling microscopy (STM). The shape changes induced by exposure to a Si-flux at 450°C were investigated as a function of the Si-coverage. During Si-capping, multifaceted domes were found to flatten and to transform into {105}-faceted pyramids and subsequently into stepped mounds through intermediate shapes. The observed sequence of morphological changes is induced by Si-Ge intermixing and is shown to be the inverse of that occurring during Ge or Si1-xGex growth on Si (001). The results are interpreted with a model in which the stable shape of an island mainly depends on its volume and composition.

Free-form optimization method for buckling of shell structures under out-of-plane and in-plane shape variations

2016 ◽  
Vol 54 (2) ◽  
pp. 275-288 ◽  
Author(s):  
Masatoshi Shimoda ◽  
Tomoki Okada ◽  
Tomohiro Nagano ◽  
Jin-Xing Shi
Keyword(s):  
Optimization Method ◽  
Shell Structures ◽  
Free Form ◽  
Out Of Plane ◽  
Plane Shape

scholarly journals A computationally efficient engineering aerodynamic model for non-planar wind turbine rotors

2021 ◽  
Author(s):  
Ang Li ◽  
Mac Gaunaa ◽  
Georg Raimund Pirrung ◽  
Sergio González Horcas
Keyword(s):  
Wind Turbine ◽  
Computational Effort ◽  
Navier Stokes ◽  
Aerodynamic Load ◽  
Computationally Efficient ◽  
Aerodynamic Model ◽  
Out Of Plane ◽  
Plane Shape ◽  
Turbine Rotors ◽  
The Difference

Abstract. In the present work, a computationally efficient engineering model for the aerodynamic load calculation of non-planar wind turbine rotors is proposed. The method is based on the vortex cylinder model, and can be used in two ways: either as a correction to the currently widely used blade element momentum (BEM) method, or used as the main model, replacing the BEM method in the engineering modelling complex. The proposed method needs the same order of computational effort as the ordinary BEM method, which makes it ideal for time-domain aero-servo-elastic simulations. The results from the proposed method are compared with results from two higher-fidelity aerodynamic models: a lifting-line method and a Navier-Stokes solver. For planar rotors, the aerodynamic loads are identical to the current BEM model when the drag force is excluded during the calculation of the induced velocities. For non-planar rotors, the influence of the blade out-of-plane shape, measured by the difference of the load between the non-planar rotor and the planar rotor, is in very good agreement with higher-fidelity models. Meanwhile, the existing BEM methods, even with a correction of radial induction included, show relatively large deviations from the higher-fidelity method results.

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