Relationship between charge redistribution and ferromagnetism at the heterointerface between perovskite oxides LaNiO${}_3$ and LaMnO${}_3$

Abstract

To investigate the relationship between the charge redistribution and ferromagnetism at the heterointerface between perovskite transition-metal oxides LaNiO${}_3$ (LNO) and LaMnO${}_3$ (LMO), we performed x-ray absorption spectroscopy and x-ray magnetic circular dichroism (XMCD) measurements. In the LNO/LMO heterostructures with asymmetric charge redistribution, the electrons donated from Mn to Ni ions are confined within one monolayer (ML) of LNO at the interface, whereas holes are distributed over 3-4 ML on the LMO side. A detailed analysis of the Ni-$L_{2,3}$ and Mn-$L_{2,3}$ XMCD spectra reveals that Ni magnetization is induced only by the Ni${}^{2+}$ ions in the 1 ML LNO adjacent to the interface, while the magnetization of Mn ions is increased in the 3-4 ML LMO of the interfacial region. The characteristic length scale of the emergent (increased) interfacial ferromagnetism of the LNO (LMO) layers is in good agreement with that of the charge distribution across the interface, indicating a close relationship between the charge redistribution due to the interfacial charge transfer and the ferromagnetism of the LNO/LMO interface. Furthermore, the XMCD spectra clearly demonstrate that the vectors of induced magnetization of both ions are aligned ferromagnetically, suggesting that the delicate balance between the exchange interactions occurring inside each layer and across the interface may induce the canted ferromagnetism of Ni${}^{2+}$ ions, resulting in weak magnetization in the 1 ML LNO adjacent to the interface.

arXiv comment22 pages, 4 figures

References in corpus (13)

• The metal-insulator transition and its relation to magnetic structure in (LaMnO3)2n/(SrMnO3)n superlattices
• Role of magnetic and orbital ordering at the metal-insulator transition in NdNiO3
• Characterization of Magnetic Components in the Diluted Magnetic Semiconductor Zn${}_{1-x}$Co${}_x$O by X-ray Magnetic Circular Dichroism
• Charge transfer and interfacial magnetism in (LaNiO3)n/(LaMnO3)2 superlattices
• Interfacial Ferromagnetism in LaNiO3/CaMnO3 Superlattices
• Metal-insulator transition in $(LaMn{O}_3{)}_{2n}/(SrMn{O}_3{)}_n$ superlattices
• Spin-orbit induced mixed-spin ground state in $R$NiO${}_3$ perovskites probed by XAS: new insight into the metal to insulator transition
• Charge transport and magnetization profile at the interface between a correlated metal and an antiferromagnetic insulator
• Dynamical Mean Field Study of Model Double-Exchange Superlattices
• Charge transfer, confinement, and ferromagnetism in LaMnO${}_3$/LaNiO${}_3$ (001)-superlattice
• Thickness-dependent ferromagnetic metal to paramagnetic insulator transition in La${}_{0.6}$Sr${}_{0.4}$MnO${}_3$ thin films studied by x-ray magnetic circular dichroism
• Role of polar compensation in interfacial ferromagnetism of LaNiO${}_3$/CaMnO${}_3$ superlattices
• Spectroscopic studies on the electronic and magnetic states of Co-doped perovskite manganite Pr0.8Ca0.2Mn1-yCoyO3 thin films

Cited by in corpus (2)

• Spin and orbital magnetic moments in perpendicularly magnetized Ni${}_{1-x}$Co${}_{2+y}$O${}_{4-z}$ epitaxial thin films: Effects of site-dependent cation valence states
• Local polarization and valence distribution in LaNiO3/LaMnO3 heterostructures