발간논문

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Vol.35, No.8, 1027 ~ 1033, 1997
Title
The Effect of Supercoooling on the Surface Morphology of ( TbBi )3 ( FeAlGa )5O12 Garnet Singel Crystal Thick Films
이완규 , 오규환 , 나형용 , 박현식 Wan Gyu Lee , Kyu Hwan Oh , Hyung Yong Ra , Hyun Sik Park
Abstract
The effect of supercooling on surface morphology of garnet single crystal films grown by liquid phase epitaxy(LPE) using a PbO/B₂O₃ flux was investigated. At the degree of supercooling smaller than 52℃, triangular hillock which has atomically smooth plane of {100} was observed. Mirror face with roughness less than 0.1㎛ was obtained at the supercooling more than 132℃. Faceting and mirror face, or faceting and hillocks were occurred simultaneously at the range of supercooling of 112℃-72℃. The change of surface morphology from hillock to mirror face with increasing supercooling is related with decreasing lattice mismatch between substrate and film, and the change of growth mechanism with increasing supercooling. Surface morphology changed from 3 dimensional nucleation and growth into 2 dimensional nucleation and lateral growth with increasing the supercooling.
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