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Interfacial Ferromagnetism in LaNiO3/CaMnO3 Superlattices



A. J. Grutter, H. Yang, Brian Kirby, M. R. Fitzsimmons, J. A. Aguiar, N. D. Browning, C. A. Jenkins, E. Arenholz, V. V. Mehta, U. S. Alaan, Y. Suzuki


We observe interfacial ferromagnetism in superlattices of the paramagnetic metal LaNiO3 and the antiferromagnetic insulator CaMnO3. The magnetic behavior can be explained in terms of an interfacial double exchange mechanism in which itinerant electrons from the LaNiO3 layer mediate canted ferromagnetism in the CaMnO3 layer. After varying the thickness of the LaNiO3; which undergoes a thickness dependent, metal-insulator transition, we found 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. Through a combination of SQUID magnetometry, X-ray magnetic circular dichroism, and polarized neutron reflectometry, we have probed the magnetic behavior and determined that the FM arises in a single unit cell of CaMnO3 at the interface. Together those results suggest that ferromagnetism can be attributed to a double exchange interaction among Mn ions mediated by the adjacent itinerant metal.
Physical Review Letters


PNR, magnetism


Grutter, A. , Yang, H. , Kirby, B. , Fitzsimmons, M. , Aguiar, J. , Browning, N. , Jenkins, C. , Arenholz, E. , Mehta, V. , Alaan, U. and Suzuki, Y. (2013), Interfacial Ferromagnetism in LaNiO<sub>3</sub>/CaMnO<sub>3</sub> Superlattices, Physical Review Letters, [online], (Accessed May 24, 2024)


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Created August 20, 2013, Updated October 12, 2021