We have investigated the effects of modification of the SrTiO3 /Co interface as well as the SrTiO3 barrier on the tunnel magnetoresistance TMR of La0.67Sr0.33MnO3 /SrTiO3 /Co junctions. Modification was realized by the introduction of one atomic layer of either TiO2 or SrO at the SrTiO3 /Co interface. Barriers with different oxygen content were also studied. In these structures we have observed positive as well as negative TMR, with a trend towards positive TMR for junctions with interfacial SrO and/or more oxygen-deficient barriers. This work offers more insight into the SrTiO3 /Co tunnel spin polarization and its sign.
|Number of pages||5|
|Journal||Physical review B: Condensed matter and materials physics|
|Publication status||Published - 23 Aug 2007|
Vera Marun, I. J., Postma, F. M., Lodder, J. C., & Jansen, R. (2007). Tunneling magnetoresistance with positive and negative sign in La0.67Sr0.33MnO3/SrTiO3/Co junctions. Physical review B: Condensed matter and materials physics, 76(6), 064426. [10.1103/PhysRevB.76.064426]. https://doi.org/10.1103/PhysRevB.76.064426