Interface ferromagnetism in oxide superlattices of CaMnO[sub 3]/CaRuO[sub 3]

Takahashi, K. S.; Kawasaki, M.; Tokura, Y.
August 2001
Applied Physics Letters;8/27/2001, Vol. 79 Issue 9, p1324
Academic Journal
Oxide superlattices composed of antiferromagnetic insulator layers of CaMnO[sub 3] (10 unit cells) and paramagnetic metal layers of CaRuO[sub 3] (N unit cells) were fabricated on LaAlO[sub 3] substrates by pulsed-laser deposition. All the superlattices show ferromagnetic transitions at an almost identical temperature (T[sub C]∼95 K) and negative magnetoresistance below T[sub C]. Each magnetization and magnetoconductance of the whole superlattice at 5 K is constant and independent of CaRuO[sub 3] layer thickness when normalized by the number of the interfaces between CaMnO[sub 3] and CaRuO[sub 3]. 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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