Interfacial Ferromagnetism in LaNiO3/CaMnO3 Superlattices
A. J. Grutter, H. Yang, B. J. Kirby, M. R. Fitzsimmons, J. A. Aguiar,, N. D. Browning, C. A. Jenkins, E. Arenholz, V. V. Mehta, U. S. Alaan, Y., Suzuki
TL;DR
This study demonstrates that interfacial ferromagnetism in LaNiO3/CaMnO3 superlattices is linked to the metallic state of LaNiO3, with ferromagnetism confined to a single unit cell at the interface, driven by double exchange interactions.
Contribution
It reveals the emergence of interfacial ferromagnetism in LaNiO3/CaMnO3 superlattices and links it to the metallic state of LaNiO3 and interfacial double exchange mechanisms.
Findings
Ferromagnetism appears only in metallic LaNiO3 layers.
Interfacial ferromagnetism is confined to a single unit cell.
Ferromagnetism is mediated by double exchange interactions.
Abstract
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.
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