scholarly journals MBE Growth and Characterization of Single Crystal and Bicrystal Permalloy (110) Thin Films

2000 ◽  
Vol 39 (S1) ◽  
pp. 220
Author(s):  
Chin-Chung Yu ◽  
Jung-Chun-Andrew Huang
Keyword(s):  
1990 ◽  
Vol 5 (8) ◽  
pp. 1605-1611 ◽  
Author(s):  
S. J. Golden ◽  
H. Isotalo ◽  
M. Lanham ◽  
J. Mayer ◽  
F. F. Lange ◽  
...  

Superconducting YBaCuO thin films have been fabricated on single-crystal MgO by the spray-pyrolysis of nitrate precursors. The effects on the superconductive behavior of processing parameters such as time and temperature of heat treatment and film thickness were investigated. The superconductive behavior was found to be strongly dependent on film thickness. Films of thickness 1 μm were found to have a Tc of 67 K while thinner films showed appreciably degraded properties. Transmission electron microscopy studies have shown that the heat treatments necessary for the formation of the superconductive phase (for example, 950 °C for 30 min) also cause a substantial degree of film-substrate interdiffusion. Diffusion distances for Cu in the MgO substrate and Mg in the film were found to be sufficient to explain the degradation of the superconductive behavior in films of thickness 0.5 μm and 0.2 μm. From the concentration profiles obtained by EDS analysis diffusion coefficients at 950 °C for Mg into the YBaCuO thin film and for Cu into the MgO substrate were evaluated as 3 × 10−19 m2/s and 1 × 10−17 m2/s, respectively.


1991 ◽  
Vol 05 (18) ◽  
pp. 1203-1211 ◽  
Author(s):  
C. ATTANASIO ◽  
L. MARITATO ◽  
A. NIGRO ◽  
S. PRISHEPA ◽  
R. SCAFURO

BSCCO thin films with T c (R = 0) higher than 80 K have been routinely prepared using a simple and reliable technique in which we completely electron beam evaporated weighted amounts of bulk pellets. The films were grown on MgO single crystal (100) substrates and showed, after an ex-situ annealing at high temperatures (840–880° C) for several hours, a strong preferential orientation with the c-axis perpendicular to the plane of the substrate. The films were characterized by Θ − 2Θ X-ray diffraction and EDS analysis and by paraconductivity and critical current measurements.


2005 ◽  
Vol 20 (9) ◽  
pp. L43-L46 ◽  
Author(s):  
Tae-hwan Kim ◽  
Sang-Hun Jeong ◽  
Il-Soo Kim ◽  
Sang Sub Kim ◽  
Byung-Teak Lee

2003 ◽  
Vol 48 (7) ◽  
pp. 929-935 ◽  
Author(s):  
Masaaki Futamoto ◽  
Kouta Terayama ◽  
Katsuaki Sato ◽  
Yoshiyuki Hirayama

1997 ◽  
Vol 12 (9) ◽  
pp. 2234-2248 ◽  
Author(s):  
E. Bonnotte ◽  
P. Delobelle ◽  
L. Bornier ◽  
B. Trolard ◽  
G. Tribillon

Two optical methods are presented for the mechanical characterization of thin films, namely real time holographic interferometry and a fringe projection method called “contouring.” These two methods are coupled to the interferometry by the phase measurements, thus allowing the displacement field to be measured at all points on the membrane. We discuss the solutions retained in terms of their precision and sensitivity. These methods are then applied to membrane bulging tests, a type of test that is widely used in micro-mechanical studies. The measurements are performed on silicon single crystal and the results are compared to the solutions calculated by finite element methods. In both cases, the good agreement between theory and experiments allows the experimental apparatus to be validated.


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