Oscillatory Exchange Coupling and Positive Magnetoresistance in Epitaxial Oxide Heterostructures

Details Oscillatory Exchange Coupling and Positive Magnetoresistance in Epitaxial Oxide Heterostructures Oscillatory Exchange Coupling and Positive Magnetoresistance in Epitaxial Oxide Heterostructures

2000-04-13

arxiv.org/abs/cond-mat/0004230v1

Physics

Condensed Matter

Materials Science

4 pages (RevTeX), 5 figures (EPS)

Scientific paper

10.1103/PhysRevLett.85.3728

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.

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