J.Q. Yu
,
Y. Zhou
,
B.C. Cai and X.L. Zhao Information Storage Research Center
,
Research Lab of Thin Films and Microfabrication Technology
,
Shanghai Jiao Tong University
,
Shanghai 200030
,
China
金属学报(英文版)
Giant magneto-impedance effect (MI) in thin films with longitudinal magnetic anisotropy is studied theoretically. The effective permeability of films as a function of external magnetic field Ha, anisotropy field and other parameters of films is presented using Landau - Lifshitz- Gilbert theory. The theoretical results agree well with experimental ones, which show a strong dependence of the impedance on the applied magnetic field.
关键词:
magneto-impedance effect
,
null
,
null
,
null
Huiguan WAN
,
Xiumei QI
,
Jing TIAN
,
Yuyong CHEN
,
Weiqiang ZHA
,
Jun JIA
材料科学技术（英文）
In this research, the materials and the compositions of the surface slurries were chosen by considering the characteristics of Ti investment casting. The effects of solid-liquid ratios on the properties of the slurry and the effects of baking temperatures on the flexural strength have also been investigated. Flawless shells having smooth inner surface were manufactured with proper technology. Ti and its alloys were melted and poured by water-cooled Cu crucible vacuum induction furnace. The qualities of the investment castings made accordingly were studied and analyzed.
关键词:
Science in China Series a-Mathematics Physics Astronomy
Recent development in the study of nonequilibrium thermophysical properties of thin films in our lab is reported. A high-speed indirect heating system by using 0.1 mus CO2 laser pulse was established. A photoelectric installation for micrometric length-change measurement, an infrared radiation pyrometer for transient temperature measurement, a high-speed acquisition system as recording device and microcomputer system for data treatment were developed. Using the systems, the traditional flash method is extended to the measurement of thermal diffusivity of the thin films of around 50 mum in thickness, and deviations of this method is analyzed for the case of thin film specimens. Nonsynchronous change of temperature rise and thermal expansion under transient heating was observed.
关键词:
thermal-diffusivity measurements
Acta Materialia
Pb thin films confined in Al were synthesized by means of repeated cold-rolling from stacked Al/Pb/Al sandwiches and magnetron sputtering deposition, respectively. The layer thickness of the confined Pb thin films was in a range of 6-27 nm. Differential scanning calorimetry (DSC) was used to systematically study the melting behavior of the confined Pb thin films. Above the equilibrium bulk melting point, a melting peak of superheated Pb was noticed in DSC traces. The degree of superheating increases with a decreasing film thickness and an increasing heating rate. The melting kinetics of the superheated Pb thin films is analyzed in terms of the lateral growth mechanism. The observed superheating of Pb thin films is attributed to the suppressed melt growth by the epitaxial Pb/Al interfacial configuration. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
关键词:
thin films;superheating;melting;kinetics;al matrix;pb;particles;temperature;nanocrystals;stability;metals;lead;solidification;crystal
Y.F.Hu
金属学报(英文版)
Polycrystalline silicon thin films were prepared by RTCVD (rapid thermal chemical vapor deposition) method on several substrates such as SSP (silicon sheet from powder) ribbon, poly-Si wafer and mono-Si wafer, lntra-granular defects such as stacking faults, twins and microstructure defects were investigated on thin films by scan electron microscopy (SEM) technique.
关键词:
poly-Si thin film
,
null
,
null
Japanese Journal of Applied Physics Part 1-Regular Papers Brief Communications & Review Papers
Silicon carbonitride thin films,were synthesized by reactive rf sputtering a silicon carbide target in nitrogen and argon atmosphere, or sputtering a silicon nitride target in methane and argon atmosphere, respectively. The Nanoindentation technique (Nanoindenter XP system with a continuous stiffness measurement technique) was employed to measure the hardness and elastic modulus of thin films. The effects of sputtering power on the mechanical properties are different for the two SiCN thin films. With increasing sputtering power, the hardness and the elastic modulus decrease for, the former but increase for the latter. The tendency is similar to the evolution trend of Si-C bonds in SiCN materials. This reflects that Si-C bonds provide greater hardness for SiCN thin films than Si-N and C-N bonds.
关键词:
silicon carbonitride;hardness;bond impact;chemical-vapor-deposition;nitride;coatings;carbide;growth
Zhenyu YUAN
材料科学技术（英文）
The superelastic properties of NiTi thin films prepared with sputtering were studied. To characterize their superelasticity, tensile and bulging and indentation tests were performed. The measured mechanisms using these three methods were compared, and the factors that influence superelasticity were described.
关键词:
Shape memory alloy
,
memory
,
alloy
,
NiTi
,
thin
,
film
,
Super
M.D.Starostenkov
,
G.M.Poletayev
,
D.M.Starostenkov
材料科学技术（英文）
The structural transformation in thin films of bimetals in the dependence on temperature and concentration of vacancies was investigated. The system Ni-Al structural transformation was realized by computer design according to the mechanism of self-sustained high-temperature synthesis. Structural transformation is characterized by the presence of dislocations, clusters of point defects and germs of intermetallic phases near interphase boundaries.
关键词:
