Interface ferromagnetism in oxide superlattices of CaMnO3/CaRuO3

Citation
Ks. Takahashi et al., Interface ferromagnetism in oxide superlattices of CaMnO3/CaRuO3, APPL PHYS L, 79(9), 2001, pp. 1324-1326
Citations number
12
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
APPLIED PHYSICS LETTERS
ISSN journal
0003-6951 → ACNP
Volume
79
Issue
9
Year of publication
2001
Pages
1324 - 1326
Database
ISI
SICI code
0003-6951(20010827)79:9<1324:IFIOSO>2.0.ZU;2-V
Abstract
Oxide superlattices composed of antiferromagnetic insulator layers of CaMnO 3 (10 unit cells) and paramagnetic metal layers of CaRuO3 (N unit cells) we re fabricated on LaAlO3 substrates by pulsed-laser deposition. All the supe rlattices show ferromagnetic transitions at an almost identical temperature (T(C)similar to 95 K) and negative magnetoresistance below T-C. Each magne tization and magnetoconductance of the whole superlattice at 5 K is constan t and independent of CaRuO3 layer thickness when normalized by the number o f the interfaces between CaMnO3 and CaRuO3. These results indicate that the ferromagnetism shows up only at the interface and is responsible for the m agnetoresistance. (C) 2001 American Institute of Physics.