Co-Doped (La,Sr)TiO3−δ: A High Curie Temperature Diluted Magnetic System with Large Spin Polarization

Herranz, G. and Ranchal, R. and Bibes, M. and Jaffres, H. and Jacquet, E. and Maurice, J.-L. and Bouzehouane, K. and Wyczisk, F. and Tafra, Emil and Basletić, Mario and Hamzić, Amir and Colliex, C. and Contour, J.-P. and Barthelemy, A. and Fert, A. (2006) Co-Doped (La,Sr)TiO3−δ: A High Curie Temperature Diluted Magnetic System with Large Spin Polarization. Physical Review Letters, 96 (2). pp. 27207-4. ISSN 0031-9007

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We report on tunneling magnetoresistance (TMR) experiments that demonstrate the existence of a significant spin polarization in Co-doped (La,Sr)TiO3−δ (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.

Item Type: Article
Keywords: spintronics, tunnel magnetoresistance, spin polarization, half-metallic ferromagnets
Date: January 2006
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2006) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 0119251
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 27 May 2014 17:48
Last Modified: 27 May 2014 17:48

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