  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 ~
4 {\AA} and the atomic terrace width is more than 2 micrometers. For a 20
monolayers (MLs) LSMO film, the magnetization is determined to be 255 +- 15
emu/cm3 at room temperature, corresponding to 1.70 + - 0.11 Bohr magneton 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.
