Interfacial Ferromagnetism in LaNiO3/CaMnO3 Superlattices

Autor:	Grutter, A. J., Yang, H., Kirby, B. J., Fitzsimmons, M. R., Aguiar, J. A., Browning, N. D., Jenkins, C. A., Arenholz, E., Mehta, V. V., Alaan, U. S., Suzuki, Y.
Rok vydání:	2013
Předmět:	Condensed Matter - Strongly Correlated Electrons Condensed Matter - Materials Science
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevLett.111.087202
Popis:	We observe interfacial ferromagnetism in superlattices of the paramagnetic metal LaNiO3 and the antiferromagnetic insulator CaMnO3. LaNiO3 exhibits a thickness dependent metal-insulator transition and we find the emergence of ferromagnetism to be coincident with the conducting state of LaNiO3. That is, only superlattices in which the LaNiO3 layers are metallic exhibit ferromagnetism. Using several magnetic probes, we have determined that the ferromagnetism arises in a single unit cell of CaMnO3 at the interface. Together these results suggest that ferromagnetism can be attributed to a double exchange interaction among Mn ions mediated by the adjacent itinerant metal. Comment: Accepted for publication in Physical Review Letters (http://prl.aps.org/), copyright (2013) by the American Physical Society
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1307.8050 Zobrazit plný text záznamu View this record from Arxiv