%0 Journal Article
%A Liu, Yaohua
%A Cuéllar Jiménez, Fabian Andrés
%A Sefrioui, Zouhair
%A Freeland, J. W.
%A Fitzsimmons, M. R.
%A León Yebra, Carlos
%A Santamaría Sánchez-Barriga, Jacobo
%A te Velthuis, S. G. E.
%T Emergent spin filter at the interface between ferromagnetic and insulating layered oxides
%D 2013
%@ 0031-9007
%U https://hdl.handle.net/20.500.14352/34772
%X We report a strong effect of interface-induced magnetization on the transport properties of magnetic tunnel junctions consisting of ferromagnetic manganite La_(0.7)Ca_(0.3)MnO_(3) and insulating cuprate PrBa_(2)Cu_(3)O_(7). Contrary to the typically observed steady increase of the tunnel magnetoresistance with decreasing temperature, this system exhibits a sudden anomalous decrease at low temperatures. Interestingly, this anomalous behavior can be attributed to the competition between the positive spin polarization of the manganite contacts and the negative spin-filter effect from the interface-induced Cu magnetization.
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