scholarly journals Three Dimensional Crystal Orientation in Rare-earth-based Cuprate Superconductors by Modulated Rotating Magnetic Field

2016 ◽  
Vol 63 (11) ◽  
pp. 947-954 ◽  
Author(s):  
Shigeru HORII ◽  
Toshiya DOI
Keyword(s):  
Magnetic Field ◽  
Rare Earth ◽  
Crystal Orientation ◽  
Cuprate Superconductors ◽  
Three Dimensional ◽  
Rotating Magnetic Field ◽  
Dimensional Crystal

Microstructures of Ultrathin Films of Sputtered PbTiO3

1994 ◽  
Vol 361 ◽  
Author(s):  
Kiyotaka Wasa ◽  
T. Satoh ◽  
K. Tab Ata ◽  
H. Adachi ◽  
Y. Ichikawa ◽  
...  
Keyword(s):  
Thin Films ◽  
Surface Roughness ◽  
Ultrathin Films ◽  
Crystal Orientation ◽  
Smooth Surface ◽  
Three Dimensional ◽  
Rf Magnetron Sputtering ◽  
X Ray Diffraction ◽  
X Ray ◽  
Dimensional Crystal

ABSTRACTUltrathin films of perovskite PbTiO3, 10–100nm thick, were epitaxially grown on miscut (001)SrTiO3 substrate by rf-magnetron sputtering at 600°C. The electron microscope and high resolution x-ray diffraction analysis suggested the evidence of epitaxial growth of (001)PbTiO3/(001)SrTiO3 with three dimensional crystal orientation. The stoichiometric film shows extremely smooth surface with the surface roughness less than 3nm. Deposition on a miscut substrate under stoichiometric conditions is essential to make continuous thin films of single crystal perovskite PbTiO3.

scholarly journals Magnetic micro-droplet in rotating field: numerical simulation and comparison with experiment

2017 ◽  
Vol 821 ◽  
pp. 266-295 ◽  
Author(s):  
J. Erdmanis ◽  
G. Kitenbergs ◽  
R. Perzynski ◽  
A. Cēbers
Keyword(s):  
Magnetic Field ◽  
Boundary Integral Equations ◽  
Three Dimensional ◽  
Dipolar Interaction ◽  
Boundary Integral ◽  
Rotating Magnetic Field ◽  
Three Dimensions ◽  
Triaxial Ellipsoid ◽  
Equilibrium Shapes ◽  
Magnetic Droplet

Magnetic droplets obtained by induced phase separation in a magnetic colloid show a large variety of shapes when exposed to an external field. However, the description of the shapes is often limited. Here, we formulate an algorithm based on three-dimensional boundary-integral equations for strongly magnetic droplets in a high-frequency rotating magnetic field, allowing us to find their figures of equilibrium in three dimensions. The algorithm is justified by a series of comparisons with known analytical results. We compare the calculated equilibrium shapes with experimental observations and find a good agreement. The main features of these observations are the oblate–prolate transition, the flattening of prolate shapes with the increase of magnetic field strength and the formation of starfish-like equilibrium shapes. We show both numerically and in experiments that the magnetic droplet behaviour may be described with a triaxial ellipsoid approximation. Directions for further research are mentioned, including the dipolar interaction contribution to the surface tension of the magnetic droplets, accounting for the large viscosity contrast between the magnetic droplet and the surrounding fluid.

Tri-axial magnetic alignment and rare-earth-dependent tri-axial magnetic anisotropies in REBa2Cu4O8 cuprate superconductors

2013 ◽  
Vol 1654 ◽  
Author(s):  
M. Yamaki ◽  
M. Furuta ◽  
T. Doi ◽  
J. Shimoyama ◽  
S. Horii
Keyword(s):  
Magnetic Field ◽  
Rare Earth ◽  
Magnetic Fields ◽  
Rare Earth Elements ◽  
Single Crystals ◽  
Cuprate Superconductors ◽  
Ambient Pressure ◽  
Axial Orientation ◽  
Magnetic Alignment ◽  
Flux Method

ABSTRACTWe report the growth of single crystals by a flux method in ambient pressure and tri-axial orientation under modulated rotation magnetic fields (MRFs) on REBa2Cu4O8 (RE124, RE; rare earth elements) compounds. RE124 crystals were grown for RE = Y, Sm, Eu, Gd, Dy, Ho, Er, Tm, and Yb through appropriate choice of source compounds. All the obtained RE124 powders were tri-axially aligned in MRF of 10T, whereas magnetization axes depended on the type of RE. Moreover, it was found from the changes in the degrees of c-axis and inplane orientation that tri-axial magnetic anisotropies of RE124 also depended on the type of RE. This indicates that it appropriate choice of RE is important for the fabrication of tri-axial oriented ceramics in lower magnetic field conditions.

scholarly journals 3-D modeling and simulation of crystal growth of GE₀.₉₈ Si₀.₀₂ under the influence of various gravity levels, G-jitter and rotating magnetic field using traveling solvent method

2021 ◽  
Author(s):  
Mehdi Mohammadi Shemirani
Keyword(s):  
Magnetic Field ◽  
Space Station ◽  
Three Dimensional ◽  
Rotating Magnetic Field ◽  
Growth Interface ◽  
Solvent Method ◽  
Buoyancy Convection ◽  
Terrestrial Condition ◽  
Flow Heat ◽  
Micro Gravity

A three-dimensional numerical simulation was conducted to study the effect of a rotating magnetic (RMF) field on the fluid flow, heat transfer and mass transfer in the presence of various gravity levels by utilizing the traveling solvent method (TSM). The presence of the RMF suppressed the buoyancy convection in the GE₀.₉₈ Si₀.₀₂ solution zone in order to get homogeneity with a flat growth interface. It was found that the intensity of the flow at the centre of the crucible decreased at a faster rate compared to the flow near the walls when increasing magnetic field intensity is combined with a certain rotational speed. This behavior created a stable and uniform silicon distribution in the horizontal plane near the growth interface in the terrestrial condition. Different magnetic field intensities for different rotational speeds were examined in both terrestrial and micro-gravity conditions. The effects of residual acceleration, known as G-jitter, on board the International Space Station and European Space Orbiter were also investigated.

Usage of Axial and Rotating Magnetic Field to Process Ge0.98Si0.02 Crystal by the Traveling Heater Method

2007 ◽  
Author(s):  
T. J. Jaber ◽  
M. Z. Saghir
Keyword(s):  
Magnetic Field ◽  
Field Intensity ◽  
Magnetic Field Intensity ◽  
Axial Magnetic Field ◽  
Three Dimensional ◽  
Rotating Magnetic Field ◽  
Growth Interface ◽  
Buoyancy Convection ◽  
Traveling Heater Method ◽  
Flow Heat

A three-dimensional numerical simulation to study the effect of magnetic field on the fluid flow, heat and mass transfer is investigated. By applying axial and rotating magnetic field (RMF), an attempt was made to suppress the buoyancy convection in the Ge0.98Si0.02 solution zone in order to get homogeneity with flat growth interface. It was found that the intensity of the flow at the centre of the crucible decreased at a faster rate compared to the flow near the walls when increasing axial magnetic field intensity. This behaviour created a stable and uniform silicon distribution in the horizontal plane near the growth interface. Different magnetic field intensities for different rotational speeds (2, 7 and 10 rpm) were examined. The results showed that the RMF has a marked effect on the silicon concentration, changing it from convex to nearly flat when the magnetic field intensity increased.

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