Room-Temperature Electronically-Controlled Ferromagnetism at the LaAlO3/SrTiO3 Interface

Abstract

Reports of emergent conductivity, superconductivity, and magnetism at oxide interfaces have helped to fuel intense interest in their rich physics and technological potential. Here we employ magnetic force microscopy to search for room-temperature magnetism in the well-studied LaAlO3/SrTiO3 system. Using electrical top gating to deplete electrons from the oxide interface, we directly observe an in-plane ferromagnetic phase with sharply defined domain walls. Itinerant electrons, introduced by a top gate, align antiferromagnetically with the magnetization, at first screening and then destabilizing it as the conductive state is reached. Subsequent depletion of electrons results in a new, uncorrelated magnetic pattern. This newfound control over emergent magnetism at the interface between two non-magnetic oxides portends a number of important technological applications.

corrected typos, added data, results unchanged

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Cited by in corpus (25)

• Recent progress in voltage control of magnetism: Materials, mechanisms, and performance
• Physics of SrTiO${}_3$-based heterostructures and nanostructures: a review
• Nanoscale Phenomena in Oxide Heterostructures
• Emergent nanoscale superparamagnetism at oxide interfaces
• Surface magnetism of strontium titanate
• Creating Two-Dimensional Electron Gas in Nonpolar Oxide Interface via Polarization Discontinuity: First-Principles Analysis of CaZrO3/SrTiO3 Heterostructure
• Tunable electron-electron interactions in LaAlO3/SrTiO3 nanostructures
• Magnetism and metal-insulator transition in oxygen deficient SrTiO${}_3$
• Controlling Kondo-like Scattering at the SrTiO3-based Interfaces
• Magneto-transport study of top- and back-gated LaAlO${}_3$/SrTiO${}_3$ heterostructures
• Plentiful magnetic moments in oxygen deficient SrTiO3
• Interface exchange processes in LaAlO${}_3$/SrTiO${}_3$ induced by oxygen vacancies
• Semiclassical theory of anisotropic transport at LaAlO3/SrTiO3 interfaces under in-plane magnetic field
• Room-temperature quantum transport signatures in graphene/LaAlO3/SrTiO3 heterostructures
• Tunable Rashba spin-orbit coupling and its interplay with multiorbital effect and magnetic ordering at oxide interfaces
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• Electrical domain writing and nanoscale potential modulation on LaVO${}_3$/SrTiO${}_3$
• Electrostatic tuning of magnetism at the conducting (111) (La${}_{0.3}$Sr${}_{0.7}$)(Al${}_{0.65}$Ta${}_{0.35}$)/SrTiO${}_3$ interface
• Low temperature magnetoresistance of (111) (La${}_{0.3}$Sr${}_{0.7}$)(Al${}_{0.65}$Ta${}_{0.35}$)/SrTiO${}_3$
• The Origin of Two-dimensional Electron Gas in Zn${}_{1-x}$Mg${}_x$O/ZnO Heterostructures
• Strong spin-orbit coupling and magnetism in (111) (La${}_{0.3}$Sr${}_{0.7}$)(Al${}_{0.65}$Ta${}_{0.35})$/SrTiO${}_3$
• Soft phonon and the central peak at the cubic-to-tetragonal phase transition in SrTiO${}_3$
• In-plane quasi-single-domain BaTiO${}_3$ via interfacial symmetry engineering
• Graphene-Complex-oxide Nanoscale Device Concepts
• Hidden antiferromagnetism on the light-irradiated surface of bulk SrTiO3 and at the LaAlO3_SrTiO3 interfaces