Origin of interface magnetism in BiMnO3/SrTiO3 and LaAlO3/SrTiO3 heterostructures

Abstract

Possible ferromagnetism induced in otherwise non-magnetic materials has been motivating intense research in complex oxide heterostructures. Here we show that a confined magnetism is realized at the interface between SrTiO3 and two insulating polar oxides, BiMnO3 and LaAlO3. By using polarization dependent x-ray absorption spectroscopy, we find that in both cases the magnetic order is stabilized by a negative exchange interaction between the electrons transferred to the interface and local magnetic moments. These local magnetic moments are associated to Ti3+ ions at the interface itself for LaAlO3/SrTiO3 and to Mn3+ ions in the overlayer for BiMnO3/SrTiO3. In LaAlO3/SrTiO3 the induced magnetic moments are quenched by annealing in oxygen, suggesting a decisive role of oxygen vacancies in the stabilization of interfacial magnetism.

5 pages, 4 figures

References in corpus (2)

• Magnetic effects at the interface between nonmagnetic oxides
• Nature of weak magnetism in SrTiO3/LaAlO3 multilayers

Cited by in corpus (39)

• Physics of SrTiO${}_3$-based heterostructures and nanostructures: a review
• A polarity-induced defect mechanism for conductivity and magnetism at polar-nonpolar oxide interfaces
• Persistent Optically Induced Magnetism in Oxygen-Deficient Strontium Titanate
• Emergent nanoscale superparamagnetism at oxide interfaces
• Surface magnetism of strontium titanate
• Competition Between Kondo Screening and Magnetism at the LaAlO${}_3$/SrTiO${}_3$ Interface
• Anomalous orbital structure in a spinel-perovskite interface $\gamma$-Al${}_2$O${}_3$/SrTiO${}_3$
• Emerging magnetism and electronic phase separation at titanate interfaces
• Controlling Kondo-like Scattering at the SrTiO3-based Interfaces
• Electron correlation and magnetism at the LaAlO${}_3$/SrTiO${}_3$ interface: A DFT+DMFT investigation
• Magnetic and electronic properties at the gamma-Al2O3/SrTiO3 interface
• In-gap features in superconducting LaAlO${}_3$-SrTiO${}_3$ interfaces observed by tunneling spectroscopy
• Anomalous magnetic ground state in LaAlO3/SrTiO3 interface probed by transport through nanowires
• Magnetic interactions at the nanoscale in trilayer titanates LaTiO${}_3$/SrTiO${}_3$/YTiO${}_3$
• Mechanical dissipation from charge and spin transitions in oxygen deficient SrTiO_3
• Enhanced spin-orbit coupling and charge carrier density suppression in LaAl1-xCrxO3/SrTiO3 heterointerfaces
• Interface exchange processes in LaAlO${}_3$/SrTiO${}_3$ induced by oxygen vacancies
• Oxygen vacancies and hydrogen doping in LaAlO3/SrTiO3 heterostructures: electronic properties and impact on surface and interface reconstruction
• 2D surprises at the surface of 3D materials: confined electron systems in transition metal oxides
• Control of magnetic anisotropy by orbital hybridization in (La0.67Sr0.33MnO3)n/(SrTiO3)n superlattice
• Oxygen-vacancy clustering and pseudogap behaviour at LaAlO3/SrTiO3 interface
• Ferromagnetism and spin-dependent transport at a complex oxide interface
• Unconventional crystal field splitting in non-centrosymmetric BaTiO${}_3$ thin films
• Hidden Order as a Source of Interface Superconductivity
• Magnetic order of tetragonal CuO ultra-thin films
• Atomic-scale 3D imaging of individual dopant atoms in a complex oxide
• Spin-Orbit Interaction and Kondo Scattering at the PrAlO${}_3$/SrTiO${}_3$ Interface: Effects of Oxygen Content
• Torque magnetometry of an amorphous-alumina/strontium-titanate interface
• A Laser-ARPES View of the 2D Electron Systems at LaAlO3/SrTiO3 and Al/SrTiO3 Interfaces
• Coexistence of high electron-mobility, unpaired spins, and superconductivity at high carrier density SrTiO${}_3$-based interfaces
• Giant orbital polarization of Ni${}^{2+}$ in square planar environment
• Coherent Epitaxial Semiconductor-Ferromagnetic Insulator InAs/EuS Interfaces: Band Alignment and Magnetic Structure
• Polarity-field driven conductivity in SrTiO${}_3$/LaAlO${}_3$: a hybrid functional study
• Kondo effect goes anisotropic in vanadate oxide superlattices
• Oxide Heterostructures from a Realistic Many-Body Perspective
• Orthorhombic distortion drives orbital ordering in an antiferromagnetic 3$d^1$ Mott insulator
• Constructing oxide interfaces and heterostructures by atomic layer-by-layer laser molecular beam epitaxy
• A two-dimensional electron gas at the (001) surface of ferromagnetic EuTiO${}_3$(001)
• Revealing magnetism in the distorted kagome $R$Ti${}_3$Bi${}_4$ ($R$ = Nd, Sm, Gd) via ARPES and XMCD