Giant magnetoelectric effect in pure manganite-manganite heterostructures

Abstract

Obtaining strong magnetoelectric couplings in bulk materials and heterostructures is an ongoing challenge. We demonstrate that manganite heterostructures of the form $(\mathrm{Insulator})/(\mathrm{LaMn}{\mathrm{O}}_3{)}_{\mathrm{n}}/(\mathrm{CaMn}{\mathrm{O}}_3{)}_{\mathrm{n}}/(\mathrm{Insulator})$ show strong multiferroicity in magnetic manganites where ferroelectric polarization is realized by charges leaking from $\mathrm{LaMn}{\mathrm{O}}_3$ to $\mathrm{CaMn}{\mathrm{O}}_3$ due to repulsion. Here, an effective nearest-neighbor electron-electron (electron-hole) repulsion (attraction) is generated by cooperative electron-phonon interaction. Double exchange, when a particle virtually hops to its unoccupied neighboring site and back, produces magnetic polarons that polarize antiferromagnetic regions. Thus a striking giant magnetoelectric effect ensues when an external electrical field enhances the electron leakage across the interface.

13 pages

References in corpus (20)

• Magnetic effects at the interface between nonmagnetic oxides
• Multiferroics: different ways to combine magnetism and ferroelectricity
• Coexistence of superconductivity and ferromagnetism in two dimensions
• Emergent properties hidden in plane view: Strong electronic correlations at oxide interfaces
• Electronic reconstruction at SrMnO3-LaMnO3 superlattice interfaces
• Band alignment and charge transfer in complex oxide interfaces
• Quantum many-body interactions in digital oxide superlattices
• Metal-insulator transition in $(LaMn{O}_3{)}_{2n}/(SrMn{O}_3{)}_n$ superlattices
• Magnetically asymmetric interfaces in a (LaMnO${}_3$)/(SrMnO${}_3$) superlattice due to structural asymmetries
• Quantum-Matter Heterostructures
• Oxide superlattices with alternating p and n interfaces
• Nanoscale magnetic structure of ferromagnet/antiferromagnet manganite multilayers
• Magnetoresistance in an all-manganite heterostructure
• Theory of Manganite Superlattice
• Phase diagram of one-dimensional Hubbard-Holstein model at quarter-filling
• Ferroelectric Control of Magnetism and Transport in Oxide Heterostructures
• The net charge at interfaces between insulators
• Interfacial Magnetism in Manganite Superlattices
• A study of cooperative breathing-mode in molecular chains
• Effects of rare earth ion size on the stability of the coherent Jahn-Teller distortions in undoped perovskite manganites

Cited by in corpus (1)

• Experimental and theoretical demonstration of negative magnetization induced by particle size reduction in nano-form Gd${}_{1-x}$Ca${}_x$MnO${}_3$