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

Autori
Herranz, Gervasi ; Basletić, Mario ; Bibes, Manuel ; Ranchal, Rocio ; Hamzić, Amir ; Tafra, Emil ; Bouzehouane, Karim ; Jacquet, E. ; Contour, Jean-Pierre ; Barthélémy, Agnes ; Fert, Albert

Izvornik
Physical Review B (1098-0121) 73 (2006), 6; 064403-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
spintronics; spin polarization; magnetic oxides; high mobility; Shubnikov-de Haas oscillations

Sažetak
We report on the growth of heterostructures composed of layers of the high-Curie temperature ferromagnet Co-doped (La, Sr)TiO_3 (Co-LSTO) with high-mobility SrTiO_3 (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 10^-4 cm2/V s at T=10 K. At high enough applied fields and low enough temperatures (\mu H>=6 T, 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^(-11) s. 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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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