Co-doped (La, Sr)TiO(3-delta) : a high Curie temperature diluted magnetic system with large spin polarization |
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Authors: | Herranz G Ranchal R Bibes M Jaffrès H Jacquet E Maurice J-L Bouzehouane K Wyczisk F Tafra E Basletic M Hamzic A Colliex C Contour J-P Barthélémy A Fert A |
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Institution: | Unité Mixte de Physique CNRS/Thales, Route départementale 128, 91767 Palaiseau Cedex, France. |
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Abstract: | We report on tunneling magnetoresistance (TMR) experiments that demonstrate the existence of a significant spin polarization in Co-doped (La, Sr)TiO(3-delta) (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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