Ferromagnetic exchange, spin-orbit coupling and spiral magnetism at the LaAlO_3/SrTiO_3 interface

Abstract

The electronic properties of the polar interface between insulating oxides is a subject of great current interest. An exciting new development is the observation of robust magnetism at the interface of two non-magnetic materials LaAlO_3 (LAO) and SrTiO_3 (STO). Here we present a microscopic theory for the formation and interaction of local moments, which depends on essential features of the LAO/STO interface. We show that correlation-induced moments arise due to interfacial splitting of orbital degeneracy. We find that gate-tunable Rashba spin-orbit coupling at the interface influences the exchange interaction mediated by conduction electrons. We predict that the zero-field ground state is a long-wavelength spiral and show that its evolution in an external field accounts semi-quantitatively for torque magnetometry data. Our theory describes qualitative aspects of the scanning SQUID measurements and makes several testable predictions for future experiments.

9 pages, 4 figures, a typo corrected from the previous version

References in corpus (7)

• Magnetic effects at the interface between nonmagnetic oxides
• Theory of t2g electron-gas Rashba interactions
• Rashba induced magnetoconductance oscillations in the LaAlO3-SrTiO3 heterostructure
• Coulomb Correlations and the Wigner-Mott Transition
• Orbital order in classical models of transition-metal compounds
• Ferromagnetism in itinerant two-dimensional t2g systems
• Ab-initio Low-Energy Model of Transition-Metal-Oxide Heterostructure LaAlO3/SrTiO3

Cited by in corpus (84)

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• Skyrmions in Chiral Magnets with Rashba and Dresselhaus Spin-Orbit Coupling
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• Skyrmions in twisted van der Waals magnets
• Six-fold crystalline anisotropic magnetoresistance in the (111) LaAlO${}_3$/SrTiO${}_3$ oxide interface
• Double perovskite heterostructures: Magnetism, Chern bands, and Chern insulators
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• Itinerant ferromagnetism of the Pd-terminated polar surface of PdCoO${}_2$
• Observation of Quantum Griffiths Singularity and Ferromagnetism at Superconducting LaAlO3/SrTiO3(110) Interface
• Effective spin model in momentum space: Toward a systematic understanding of multiple-$Q$ instability by momentum-resolved anisotropic exchange interactions
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• Spirals and skyrmions in two dimensional oxide heterostructures
• Mean-field approach for skyrmion lattice in hexagonal frustrated antiferromagnets
• Competition Between Kondo Screening and Magnetism at the LaAlO${}_3$/SrTiO${}_3$ Interface
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• Controlling Kondo-like Scattering at the SrTiO3-based Interfaces
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• Anisotropic, multi-carrier transport at the (111) LaAlO${}_3$/SrTiO${}_3$ interface
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• Planar Topological Hall Effect from Conical Spin Spirals
• Strong Coupling Expansion of the Extended Hubbard Model with Spin-Orbit Coupling
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• A hierarchy of multi-moment skyrmion phases in twisted magnetic bilayers
• Anomalous Fermi liquid phase in metallic Skyrmion crystals
• Antiferromagnetic Skyrmions and Skyrmion Density Wave in Rashba Hund's Insulator
• Oxygen vacancies and hydrogen doping in LaAlO3/SrTiO3 heterostructures: electronic properties and impact on surface and interface reconstruction
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• Coupled spin-charge order in frustrated itinerant triangular magnets
• Bose-Bose Mixtures with Synthetic Spin-Orbit Coupling in Optical Lattices
• The Pairing of Spin-orbit Coupled Fermi Gas in Optical Lattice
• Magnetic and nematic orders of the 2DEG at oxide (111) surfaces and interfaces
• Chiral Spin Order in Kondo-Heisenberg systems
• Experimental Evidence of t2g Electron-Gas Rashba Interaction Induced by Asymmetric Orbital Hybridization
• Ferromagnetism and spin-dependent transport at a complex oxide interface
• Tunable Rashba spin-orbit coupling and its interplay with multiorbital effect and magnetic ordering at oxide interfaces
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• Magnetic and transport signatures of Rashba spin-orbit coupling on the ferromagnetic Kondo lattice model in two dimensions
• Phase segregation of superconductivity and ferromagnetism at LaAlO${}_3$/SrTiO${}_3$ interface
• Emergent c-axis magnetic helix in manganite-nickelate superlattices
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• Anomalous transport near the Lifshitz transition at the LaAlO${}_3$/SrTiO${}_3$ interface
• Observation of transient superconductivity at the LaAlO${}_3$/SrTiO${}_3$ interface
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• Monte Carlo studies of skyrmion stabilization under geometric confinement and uniaxial strain
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• Linear colossal magnetoresistance driven by magnetic textures in LaTiO3 thin films on SrTiO3
• Infinite critical boson non-Fermi liquid on heterostructure interfaces
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