Epitaxial growth and properties of La0.7Sr0.3MnO3 thin films with micrometer wide atomic terraces

La0.7Sr0.3MnO3 (LSMO) films with extraordinarily wide atomic terraces are epitaxially grown on SrTiO3 (100) substrates by pulsed laser deposition. Atomic force microscopy measurements on the LSMO films show that the atomic step is similar to 4 angstrom and the atomic terrace width is more than 2 mu m. For a 20 monolayers (MLs) LSMO film, the magnetization is determined to be 255 +/- 15 emu/cm(3) at room temperature, corresponding to 1.70 +/- 0.11 mu(B) per Mn atom. As the thickness of LSMO increases from 8 MLs to 20 MLs, the critical thickness for the temperature dependent insulator-to-metal behavior transition is shown to be 9 MLs. Furthermore, post-annealing in oxygen environment improves the electron transport and magnetic properties of the LSMO films. (C) 2015 AIP Publishing LLC.