Oscillatory Exchange Coupling and Positive Magnetoresistance in   Epitaxial Oxide Heterostructures
  Oscillations in the exchange coupling between ferromagnetic $La_{2/3}Ba_{1/3}MnO_3$ layers with paramagnetic $LaNiO_3$ spacer layer thickness has been observed in epitaxial heterostructures of the two oxides. This behavior is explained within the RKKY model employing an {\it ab initio} calculated band structure of $LaNiO_3$, taking into account strong electron scattering in the spacer. Antiferromagnetically coupled superlattices exhibit a positive current-in-plane magnetoresistance. 
K. R. Nikolaev, A. Yu. Dobin, I. N. Krivorotov, W. K. Cooley, A.   Bhattacharya, A. L. Kobrinskii, L. I. Glazman, R. M. Went...