  We report a new spin-injection effect found for a manganite using a specially
fabricated sample. A wire of La0.7Sr0.3MnO3 was patterned by means of focused
ion beam etching, and the central part was subsequently irradiated with Ga+
ions lightly. The ferromagnetic Curie temperature was reduced locally by the
irradiation from Tc to Tc', and thus a sequential
ferromagnetic/paramagnetic/ferromagnetic structure was realized along the wire
between Tc and Tc'. The injection of spin-polarized current from the
ferromagnetic manganite into the paramagnetic part rendered the latter
ferromagnetic and more conductive. This can be explained by assuming the
suppression of spin fluctuation in the paramagnet by the injected spins.
