Magnetic effects at the interface between non-magnetic oxides

Alexander Brinkman, Mark Huijben, M. van Zalk, J. Huijben, U. Zeitler, J.C. Maan, Wilfred Gerard van der Wiel, Augustinus J.H.M. Rijnders, David H.A. Blank, Johannes W.M. Hilgenkamp

Research output: Contribution to journalArticleAcademicpeer-review

1222 Citations (Scopus)
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Abstract

The electronic reconstruction at the interface between two insulating oxides can give rise to a highly conductive interface1,2. Here we show how, in analogy to this remarkable interfaceinduced conductivity, magnetism can be induced at the interface between the otherwise non-magnetic insulating perovskites SrTiO3 and LaAlO3. A large negative magnetoresistance of the interface is found, together with a logarithmic temperature dependence of the sheet resistance. At lowtemperatures, the sheet resistance reveals magnetic hysteresis. Magnetic ordering is a key issue in solid-state science and its underlying mechanisms are still the subject of intense research. In particular, the interplay between localized magnetic moments and the spin of itinerant conduction electrons in a solid gives rise to intriguingmany-body effects such as Ruderman–Kittel–Kasuya–Yosida interactions3, the Kondo effect4 and carrier-induced ferromagnetism in diluted magnetic semiconductors5. The conducting oxide interface now provides a versatile system to induce and manipulate magnetic moments in otherwise non-magnetic materials.
Original languageEnglish
Pages (from-to)493-496
Number of pages4
JournalNature materials
Volume6
Issue number7
DOIs
Publication statusPublished - 3 Jun 2007

Keywords

  • EWI-17344
  • IR-58978
  • METIS-242276

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