Co-doped (La,Sr)TiO3-d: a high-Curie temperature diluted magnetic system with large spin-polarization

Abstract

We report on tunneling magnetoresistance (TMR) experiments that demonstrate the existence of a significant spin polarization in Co-doped (La,Sr)TiO3-d (Co-LSTO), a ferromagnetic diluted magnetic oxide system (DMOS) with high Curie temperature. These TMR experiments have been performed on magnetic tunnel junctions associating Co-LSTO and Co electrodes. Extensive structural analysis of Co-LSTO combining high-resolution transmission electron microscopy and Auger electron spectroscopy excluded the presence of Co clusters in the Co-LSTO layer and thus, the measured ferromagnetism and high spin polarization are intrinsic properties of this DMOS. Our results argue for the DMOS approach with complex oxide materials in spintronics.

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Cited by in corpus (8)

• Magnetic effects at the interface between nonmagnetic oxides
• High Mobility in LaAlO3/SrTiO3 Heterostructures: Origin, Dimensionality and Perspectives
• Oxide spintronics
• Magnetism and metal-insulator transition in oxygen deficient SrTiO${}_3$
• Full oxide heterostructure combining a high-Tc diluted ferromagnet with a high-mobility conductor
• Electronic and magnetic properties of structural defects in SrTiO${}_3$(Co)
• Systematic changes of the electronic structure of the diluted ferromagnetic oxide Li-doped Ni${}_{1-x}$Fe${}_x$O with hole doping
• Cobalt in strontium titanate as a new off-center magnetic impurity