title: Room-temperature electronically-controlled ferromagnetism at the LaAlO₃/SrTiO₃ interface.
abstract: Reports of emergent conductivity, superconductivity and magnetism have helped to fuel intense interest in the rich physics and technological potential of complex-oxide interfaces. Here we employ magnetic force microscopy to search for room-temperature magnetism in the well-studied LaAlO3/SrTiO3 system. Using electrical top gating to control the electron density at the oxide interface, we directly observe the emergence of an in-plane ferromagnetic phase as electrons are depleted from the interface. Itinerant electrons that are reintroduced into the interface align antiferromagnetically with the magnetization at first screening and then destabilizing it as the conductive regime is approached. Repeated cycling of the gate voltage results in new, uncorrelated magnetic patterns. This newfound control over emergent magnetism at the interface between two non-magnetic oxides portends a number of important technological applications.
authors.affiliation: 1] Department of Physics &Astronomy, University of Pittsburgh, 3941 O'Hara Street, Pittsburgh, Pennsylvania 15260, USA [2] Pittsburgh Quantum Institute, Pittsburgh, Pennsylvania 15260, USA.
authors.forename: Feng
authors.initials: F
authors.lastname: Bi
authors.affiliation: 1] Department of Physics &Astronomy, University of Pittsburgh, 3941 O'Hara Street, Pittsburgh, Pennsylvania 15260, USA [2] Pittsburgh Quantum Institute, Pittsburgh, Pennsylvania 15260, USA.
authors.forename: Mengchen
authors.initials: M
authors.lastname: Huang
authors.affiliation: Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
authors.forename: Sangwoo
authors.initials: S
authors.lastname: Ryu
authors.affiliation: Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
authors.forename: Hyungwoo
authors.initials: H
authors.lastname: Lee
authors.affiliation: Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
authors.forename: Chung-Wung
authors.initials: CW
authors.lastname: Bark
authors.affiliation: Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
authors.forename: Chang-Beom
authors.initials: CB
authors.lastname: Eom
authors.affiliation: 1] Department of Physics &Astronomy, University of Pittsburgh, 3941 O'Hara Street, Pittsburgh, Pennsylvania 15260, USA [2] Pittsburgh Quantum Institute, Pittsburgh, Pennsylvania 15260, USA.
authors.forename: Patrick
authors.initials: P
authors.lastname: Irvin
authors.affiliation: 1] Department of Physics &Astronomy, University of Pittsburgh, 3941 O'Hara Street, Pittsburgh, Pennsylvania 15260, USA [2] Pittsburgh Quantum Institute, Pittsburgh, Pennsylvania 15260, USA.
authors.forename: Jeremy
authors.initials: J
authors.lastname: Levy