Abstract
In this paper, BiFeO3/La0.7Sr0.3MnO3 heterostructure is fabricated on the SrTiO (100) substrate using the pulsed laser deposition method (PLD). Magnetization hystersis loops of the BiFeO3/La0.7Sr0.3MnO3 heterostructure are obtained at 300K and 80K. The heterostructure exhibits evident ferromagnetic characteristic at both room temperature and 80K. At 80K, magnetization of the heterostructure is stronger than room temperature magnetic measure. The temperature dependence of resistance of the heterostructure with different currents is also studied. With different currents, there appears to be a peak resistance about 180K. When I is 50 uA, ΔR is 68.4%. And when I is 100 uA, ΔR is 79.3%. The BiFeO3/La0.7Sr0.3MnO3 heterostructure exhibits a positive colossal magnetoresistance (MR) effect over a temperature range of 80–300K. In our heterostructure, maximum magnetic resistance appears in 210K, and MR = 44.34%. Mechanism analysis of the leakage current at room temperature shows that the leakage current is the interface-limited Schottky emission, but not dominated by the Poole-Frenkel emission or SCLC.
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