A-site driven ferroelectricity in strained ferromagnetic L2NiMnO6 thin films

Abstract

We report on theoretical and experimental investigation of A-site driven ferroelectricity in ferromagnetic La2NiMnO6 thin films grown on SrTiO3 substrates. Structural analysis and density functional theory calculations show that epitaxial strain stretches the rhombohedral La2NiMnO6 crystal lattice along the [111]cubic direction, triggering a displacement of the A-site La ions in the double perovskite lattice. The lattice distortion and the A-site displacements stabilize a ferroelectric polar state in ferromagnetic La2NiMnO6 crystals. The ferroelectric state only appears in the rhombohedral La2NiMnO6 phase, where MnO6 and NiO6 octahedral tilting is inhibited by the 3-fold crystal symmetry. Electron localization mapping showed that covalent bonding with oxygen and 6s orbital lone pair formation are negligible in this material.

arXiv commentin press

References in corpus (10)

• First-principles study of spontaneous polarization in multiferroic BiFeO${}_3$
• Multiferroicity due to charge ordering
• Octahedral rotation-induced ferroelectricity in cation ordered perovskites
• Epitaxial-strain-induced multiferroicity in SrMnO${}_3$ from first principles
• Electronic Structure, Phonons and Dielectric Anomaly in Ferromagnetic Insulating Double Perovskite La2NiMnO6
• Multiferroic behavior in the new double-perovskite Lu${}_2$MnCoO${}_6$
• Magnetism driven ferroelectricity above liquid nitrogen temperature in Y2CoMnO6
• Frustration of tilts and A-site driven ferroelectricity in KNbO_3-LiNbO_3 alloys
• Spontaneous atomic ordering and magnetism in epitaxially stabilized double perovskites
• Pyroelectric detection of spontaneous polarization in magnetite thin films

Cited by in corpus (6)

• Lattice dynamics and ferroelectric properties of the nitride perovskite ${\mathrm{LaWN}}_3$
• Magnetic behavior, Griffiths phase and magneto-transport study in 3$d$ based nano-crystalline double perovskite Pr${}_2$CoMnO${}_6$
• Strain engineering multiferroism in Pnma NaMnF3 fluoroperovskite
• Critical behavior and magnetocaloric effect in ferromagnetic nano-crystalline Pr${}_2$CoMnO${}_6$
• Robust ferromagnetism in insulating La${}_2$NiMnO${}_6$ thin films
• Existence of inter coupled structural, electronic and magnetic states in Sm${}_2$NiMnO${}_6$ double perovskite