We report heteroepitaxial growth of multiferroic BiFeO_3 thin films by RF magnetron sputtering on lattice-matched SrTiO_3 substrates, as well as preparation and electrical properties of the heterostructures formed by growing BiFeO_3 thin films on highly conductive LaNiO_3 films and n-Si substrates. Nonlinear and rectifying current-voltage (I-U) characteristics were revealed for the heterojunctions in a wide temperature range (T=78-300 K).
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