  The ferromagnetic phase in La0.7Sr0.3MnO3 manganite is completely spin
polarized (100%) at room temperature. This is demonstrated on high quality
epitaxial films by Spin-Polarized Scanning Tunneling Microscopy. The films
consist of a highly homogeneous ferromagnetic (FM) phase in which minority
paramagnetic (PM) defects are embedded (less than 1% for best films). PM
defects exhibit featureless tunneling spectroscopic characteristics and an
insulating-like conductance. FM phase exhibit metallic behavior and strongly
nonlinear characteristics. Deconvolution of the spectroscopic curves for the FM
phase reveals the totally spin-splitted egt2g manganite bands whose shape and
width are in an excellent agreement with optical and photoemission spectroscopy
data. These results promote the manganites as efficient spin polarized
injectors at ambient conditions.
