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Preparation of large area and investigation of initial film growth of YBa2Cu3O7 by scanning pulsed laser deposition
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1996
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Materials ScienceLarge AreaExtended PlumeOptical MaterialsEngineeringSurface ScienceApplied PhysicsLaser ApplicationsInitial Film GrowthYbco FilmsLaser DepositionThin Film Process TechnologyLaser-assisted DepositionThin FilmsPulsed Laser DepositionEpitaxial GrowthThin Film Processing
A pulsed laser deposition system with a rotating reflector, which can generate an extended plume with a diameter of about 40 mm, has been proven to be viable in producing large area YBa2Cu3O7 (YBCO) thin films. Films with uniformity of thickness and electrical properties to within a few percents were obtained. By making a further modification on this laser scanning system, YBCO films with various thicknesses can be deposited in situ on several pieces of substrates under essentially identical deposition conditions, and particularly, in a continuous fashion. The atomic force microscopy (AFM) images reveal that films grown on NdGaO3 follow the Stranski–Krastanov (layer then island growth) mode, while films grown on as-polished MgO and on annealed MgO follow the Volmer–Weber (islands without layer growth) mode and step-flow mode, respectively.