Bimodal Island Size Distribution in Heteroepitaxial Growth
نویسندگان
چکیده
منابع مشابه
Self-assembled island formation in heteroepitaxial growth
We investigate island formation during heteroepitaxial growth using an atomistic model that incorporates deposition, activated diffusion and stress relaxation. For high misfit the system naturally evolves into a state characterized by a narrow island size distribution. The simulations indicate the existence of a strain assisted kinetic mechanism responsible for the self-assembling process, invo...
متن کاملLevel-set simulation for the strain-driven sharpening of the island-size distribution during submonolayer heteroepitaxial growth
We use an island dynamics model for heteroepitaxial growth to study the narrowing and sharpening of the island-size distribution as a function of the strain in the submonolayer growth regime. Our island dynamics model is coupled to an elastic model that is based on atomistic harmonic interactions. The elastic equations are solved self-consistently at every time step during the simulation for th...
متن کاملIsland Shape Transition in Heteroepitaxial Metal Growth on Square Lattices
A novel mechanism for ramified island growth in the initial stages of metal heteroepitaxy is reported. Scanning tunneling microscopy measurements reveal that copper islands on Ni(100), as they grow in size, undergo a shape transition. Below a critical size of ø480 atoms, compact islands form, while above this size they develop a ramified shape. This effect is not of kinetic origin and has been ...
متن کاملOrigin of the bimodal island size distribution in ultrathin films of para-hexaphenyl on mica
Ultrathin films of para-hexaphenyl (6P ) were prepared on freshly cleaved and sputter-amorphized mica(001) by physical vapor deposition. Ex situ atomic force microscopy (AFM) revealed a bimodal island size distribution for the films on both surfaces. On freshly cleaved mica long needlelike islands exist, which are surrounded by small crystallites. On the sputter-amorphized substrates, large den...
متن کاملBimodal Size-distribution of Bainite Plates
There are two well-known phenomena associated with the bainite reaction, both of which have been exploited here to enhance the mechanical behaviour of steel. Firstly, the bainite plate size decreases as the transformation temperature is reduced. Secondly, it is bad to have large regions of untransformed austenite in the microstructure; this is because they can transform, under the influence of ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review Letters
سال: 2014
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.112.075503