Evidence of oxygen ferromagnetism in ZnO based materials

Clara Guglieri, Eva Céspedes, Ana Espinosa, María Ángeles Laguna-Marco, Noemi Carmona, Yukiharu Takeda, Tetsuo Okane, Tetsuya Nakamura, Mar García-Hernández, Miguel Ángel García, Jesús Chaboy

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

Discoveries of room-temperature ferromagnetism (RTFM) in semiconductors hold great promise in future spintronics technologies. Unfortunately, this ferromagnetism remains poorly understood and the debate concerning the nature, carrier-mediated versus defect-mediated, of this ferromagnetism in semiconducting oxides is still open. Here, by using X-ray absorption (XAS) and X-ray magnetic circular dichroism (XMCD), it is demonstrated that the oxygen ions have a ferromagnetic response in different ZnO-based compounds showing RTFM behavior: ZnO nanoparticles capped with organic molecules and ZnO/ZnS heterostructures. These results demonstrate the intrinsic occurrence of RTFM in these systems, and point out that it is not related to the metallic cation but it relays on the conduction band of the semiconductor.

Original languageEnglish
Pages (from-to)2094-2100
Number of pages7
JournalAdvanced Functional Materials
Volume24
Issue number14
DOIs
Publication statusPublished - 2014 Apr 9
Externally publishedYes

Keywords

  • X-ray absorption spectroscopy
  • X-ray magnetic circular dichroism
  • magnetic semiconductors
  • oxide surfaces
  • surface magnetism

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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