Title :
Co-Doped (La,Sr)TiO3: A High-Tc Diluted Ferromagnet With Large Spin Polarization
Author :
Herranz, G. ; Basletic, M. ; Bibes, M. ; Ranchal, R. ; Jaffres, H. ; Hamzic, A. ; Tafra, E. ; Maurice, J. ; Colliex, C. ; Bouzehouane, K. ; Jacquet, E. ; Contour, J. ; Barthelemy, A. ; Fert, A.
Author_Institution :
CNRS/Thales, Palaiseau
Abstract :
The study reports on the magnetic properties and spin polarization of (La,Sr)Ti1-xCoxO3 (Co-LSTO) thin films. Tunneling magnetoresistance (TMR) measurements on magnetic tunnel junctions were performed to probe the spin polarisation. A large spin of -80% has been determined at low temperature, indicating that the carriers are highly spin-polarized in this system. Structural analysis was done through use of combining high-resolution transmission electron microscopy, Auger electron spectroscopy and X-ray magnetic circular dichroism. As a result, the measured ferromagnetism and high spin polarization are intrinsic properties of this DMOS. Finally a report on planar magnetotransport experiments on Co-LSTO films grown on SrTiO3 (STO) substrates is presented.
Keywords :
Auger electron spectra; Curie temperature; Shubnikov-de Haas effect; cobalt; dilute magnetic materials; electron spin polarisation; ferromagnetic materials; lanthanum compounds; magnetic circular dichroism; magnetic semiconductors; magnetic thin films; magnetisation; strongly correlated electron systems; strontium compounds; transmission electron microscopy; tunnelling magnetoresistance; vacancies (crystal); Auger electron spectroscopy; Co-LSTO thin films; Co-doped TiO2; LaSrTiCoO3; Shubnikov-de Haas oscillations; SrTiO3; X-ray magnetic circular dichroism; cobalt clusters; diluted magnetic oxide systems; electronic mobilities; extrinsic carriers; ferromagnetic correlations; high-resolution transmission electron microscopy; long-order magnetic order; lowest oxygen growth pressures; magnetic semiconductors; magnetic tunnel junctions; magnetization; planar magnetotransport experiments; quantum oscillations; room temperature ferromagnetism; spin polarization; spintronics; strongly correlated metal; structural defects; tunneling magnetoresistance measurements; vacancies; Electrons; Magnetic analysis; Magnetic films; Magnetic properties; Magnetic tunneling; Performance evaluation; Polarization; Probes; Temperature; Tunneling magnetoresistance;
Conference_Titel :
Magnetics Conference, 2006. INTERMAG 2006. IEEE International
Conference_Location :
San Diego, CA
Print_ISBN :
1-4244-1479-2
DOI :
10.1109/INTMAG.2006.375643
