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A new method for continuous compositional-spread (CCS) thin-film fabricationbased on pulsed-laser deposition (PLD) is introduced. This approach is based ona translation of the substrate heater and the synchronized firing of theexcimer laser, with the deposition occurring through a slit-shaped aperture.Alloying is achieved during film growth (possible at elevated temperature) bythe repeated sequential deposition of sub-monolayer amounts. Our approachovercomes serious shortcomings in previous in-situ implementations of CCS basedon sputtering or PLD, in particular the variations of thickness across thecompositional spread and the differing deposition energetics as function ofposition. While moving-shutter techniques are appropriate for PLD-approachesyielding complete spreads on small substrates (i.e. small as compared todistances over which the deposition parameters in PLD vary, typically about 1cm), our method can be used to fabricate samples that are large enough forindividual compositions to be analyzed by conventional techniques, includingtemperature-dependent measurements of resistivity and dielectric and magneticand properties (i.e. SQUID magnetometry). Initial results are shown for spreadsof (Sr,Ca)RuO$_3$.Comment: 6 pages, 8 figures, accepted for publication in Rev. Sci. Instru

An improved continuous compositional-spread technique based on pulsed-laser deposition and applicable to large substrate areas