Interface ferromagnetism in oxide superlattices of CaMnO/CaRuO
Applied Physics Letters, ISSN: 0003-6951, Vol: 79, Issue: 9, Page: 1324-1326
2001
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Article Description
Oxide superlattices composed of antiferromagnetic insulator layers of CaMnO (10 unit cells) and paramagnetic metal layers of CaRuO (N unit cells) were fabricated on LaAlO substrates by pulsed-laser deposition. All the superlattices show ferromagnetic transitions at an almost identical temperature (TC∼95 K) and negative magnetoresistance below TC. Each magnetization and magnetoconductance of the whole superlattice at 5 K is constant and independent of CaRuO layer thickness when normalized by the number of the interfaces between CaMnO and CaRuO. These results indicate that the ferromagnetism shows up only at the interface and is responsible for the magnetoresistance. © 2001 American Institute of Physics.
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