The quest for realizing highly spin-polarized conduction in materials at room temperature is one of the central themes of materials physics. We report on the realization of a conducting interface in $\mathrm{LaFe}{\mathrm{O}}_3$ (LFO)-$\mathrm{SrTi}{\mathrm{O}}_3$ (STO) that demonstrates spin-polarization signatures, namely, negative magnetoresistance (MR) and anomalous Hall resistivity $>150$ K and even up to room temperature. However, the same system shows positive MR and normal Hall effect at temperatures $<150$ K. From density functional theory calculations, we find that this is related to the structural transition of the substrate, amplified here as the changes happen at the interface. This leads to a net spin polarization of the interface states at the Fermi energy in the high-temperature phase, allowing for an anomalous Hall effect and negative MR. In addition, this interface appears to be almost transparent in the entire range of visible light. Our observation might be viewed as a step toward room-temperature transparent oxide spintronics.

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• Electrical conductivity
• Magnetotransport
• 2-dimensional systems
• Interfaces
• Perovskites
• Thin films