Journal
APPLIED PHYSICS LETTERS
Volume 79, Issue 9, Pages 1324-1326Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1398331
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Oxide superlattices composed of antiferromagnetic insulator layers of CaMnO3 (10 unit cells) and paramagnetic metal layers of CaRuO3 (N unit cells) were fabricated on LaAlO3 substrates by pulsed-laser deposition. All the superlattices show ferromagnetic transitions at an almost identical temperature (T(C)similar to 95 K) and negative magnetoresistance below T-C. Each magnetization and magnetoconductance of the whole superlattice at 5 K is constant and independent of CaRuO3 layer thickness when normalized by the number of the interfaces between CaMnO3 and CaRuO3. These results indicate that the ferromagnetism shows up only at the interface and is responsible for the magnetoresistance. (C) 2001 American Institute of Physics.
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