Abstract
Excimer laser irradiation (248 nm, 34 ns) of SrTiO3(100)single crystals was studied in order to resolve the feasibility of obtaining well-defined patterned structures. Spots irradiated with a single pulse in the 0.4–1 J/cm2 fluence range presented a pattern of cracks along crystallographic directions, which do not propagate beyond the borders, and no ejected material was observed on the non- irradiated areas. Arrays were patterned by translating the single crystal, and different morphologies were found depending on the width of the tracks. Tracks 10 μm wide or more developed a pattern of cracks, whereas 3 μm wide tracks did not. Artificial arrays in magnetoresistive La2/3Sr1/3MnO3 thin films were prepared by using SrTiO3(100) single-crystal substrates in which arrays had been previously patterned. The interfaces originated a substantial low-field tunnel magnetoresistance.
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