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

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          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.

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          Author and article information

          Journal
          21 July 2013
          2013-11-27
          Article
          10.1038/ncomms6019
          1307.5557
          cdce1c48-c668-4dc2-9ce1-30771e5fab37

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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          Custom metadata
          corrected typos, added data, results unchanged
          cond-mat.mes-hall cond-mat.mtrl-sci

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