Full oxide heterostructure combining a high-Tc diluted ferromagnet with a high-mobility conductor

Abstract

We report on the growth of heterostructures composed of layers of the high-Curie temperature ferromagnet Co-doped (La,Sr)TiO3 (Co-LSTO) with high-mobility SrTiO3 (STO) substrates processed at low oxygen pressure. While perpendicular spin-dependent transport measurements in STO//Co-LSTO/LAO/Co tunnel junctions demonstrate the existence of a large spin polarization in Co-LSTO, planar magnetotransport experiments on STO//Co-LSTO samples evidence electronic mobilities as high as 10000 cm2/Vs at T = 10 K. At high enough applied fields and low enough temperatures (H < 60 kOe, T < 4 K) Shubnikov-de Haas oscillations are also observed. We present an extensive analysis of these quantum oscillations and relate them with the electronic properties of STO, for which we find large scattering rates up to ~ 10 ps. Thus, this work opens up the possibility to inject a spin-polarized current from a high-Curie temperature diluted oxide into an isostructural system with high-mobility and a large spin diffusion length.

to appear in Phys. Rev. B

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• Anomalously large measured thermoelectric power factor in Sr${}_{1-x}$La${}_x$TiO${}_3$ thin films due to SrTiO${}_3$ substrate reduction
• Two-Dimensional Electron Gas with High Mobility Forming at BaO/SrTiO3 Interface
• Origin and Perspectives of High Mobility in LaAlO3/SrTiO3 Structures