Titanium d(xy) ferromagnetism at the LaAlO3/SrTiO3 interface

J. -S. Lee*, Y. W. Xie, H. K. Sato, Y. Hikita, H. Y. Hwang, C. -C. Kao, Chris Bell

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

234 Citations (Scopus)

Abstract

A number of recent transport and magnetization studies have shown signs of ferromagnetism in the LaAlO3/SrTiO3 heterostructure(1-6), an unexpected property with no bulk analogue in the constituent materials. However, no experiment thus far has provided direct information on the host of the magnetism(7-11). Here we report spectroscopic investigations of the magnetism using element-specific techniques, including X-ray magnetic circular dichroism and X-ray absorption spectroscopy, along with corresponding model calculations. We find direct evidence for in-plane ferromagnetic order at the interface, with Ti3+ character in the d(xy) orbital of the anisotropic t(2g) band. These findings establish a striking example of emergent phenomena at oxide interfaces.

Original languageEnglish
Pages (from-to)703-706
Number of pages4
JournalNature Materials
Volume12
Issue number8
Early online date2 Jun 2013
DOIs
Publication statusPublished - Aug 2013

Keywords

  • SUPERCONDUCTIVITY
  • HETEROSTRUCTURES
  • COEXISTENCE
  • OXIDES

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