Low noise all-oxide magnetic tunnel junctions based on a La$_{0.7}$Sr$_{0.3}$Mn$_{O3}$/Nb:SrTiO$_3$ interface

Georges Kurij 1, * Aurélie Solignac 2 T. Maroutian 1 G. Agnus 1 R. Guerrero 1 L.E. Calvet 1 Myriam Pannetier-Lecoeur 2 Philippe Lecoeur 1
* Corresponding author
2 LNO - Laboratoire Nano-Magnétisme et Oxydes
SPEC - UMR3680 - Service de physique de l'état condensé, IRAMIS - Institut Rayonnement Matière de Saclay
Abstract : All-oxide magnetic tunnel junctions with a semiconducting barrier, formed by the half-metallic ferromagnet La$_{0.7}$Sr$_{0.3}$Mn$_{O3}$ and n-type semiconductor SrTi$_{0.8}$Nb$_{0.2}$O$_3$, were designed, fabricated, and investigated in terms of their magneto-transport properties as a function of applied bias and temperature. We found that the use of the heavily Nb-doped SrTiO$_3$ as a barrier results in significant improvement in the reproducibility of results, i.e., of large tunnel magnetoresistance (TMR) ratios, and a spectral noise density reduced by three orders of magnitude at low temperature. We attribute this finding to a considerably decreased amount of point defects in SrTi$_{0.8}$Nb$_{0.2}$O$_3$, especially oxygen vacancies, compared with the conventional insulating SrTiO$_3$ barrier.
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Georges Kurij, Aurélie Solignac, T. Maroutian, G. Agnus, R. Guerrero, et al.. Low noise all-oxide magnetic tunnel junctions based on a La$_{0.7}$Sr$_{0.3}$Mn$_{O3}$/Nb:SrTiO$_3$ interface. Applied Physics Letters, American Institute of Physics, 2017, 110, pp.82405. ⟨10.1063/1.4977173⟩. ⟨cea-01503092⟩

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