Magnetic properties of Fe-implanted ZnO nanotips grown by metal-organic chemical vapor deposition

P. Wu, G. Saraf, Yicheng Lu, D. H. Hill, D. A. Arena, Robert Bartynski, F. Cosandey, J. F. Al-Sharab, L. Wielunski, R. Gateau, J. Dvorak, A. Moodenbaugh, J. A. Raley, Yung Kee Yeo

Research output: Contribution to journalArticle

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Abstract

Fe ions were implanted into well-aligned single-crystal ZnO nanotips grown on SiO 2/quartz substrates using metal-organic chemical vapor deposition (MOCVD). The Fe ion concentration distribution within a single nanotip is mapped by electron energy loss spectroscopy (EELS) and energy dispersive spectroscopy (EDS) and the nanotips imaged by high-resolution transmission electron microscopy (TEM). X-ray absorption spectroscopy (XAS) identified the presence of Fe 2+ and Fe 3+ ions in both as-implanted and annealed samples. However, Fe 3+ ion concentration increased during postannealing. Superconducting quantum interference device (SQUID) measurements show that the as-implanted and postannealed ZnO nanotips are ferromagnetic at room temperature. The observed ferromagnetism in the as-implanted nanotips is primarily attributed to the near surface 10-nm region that has high Fe concentration. The saturation magnetization reduces after annealing.

Original languageEnglish (US)
Pages (from-to)529-532
Number of pages4
JournalJournal of Electronic Materials
Volume36
Issue number4
DOIs
Publication statusPublished - Apr 1 2007

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry

Keywords

  • Ferromagnetism
  • Implantation
  • Spintronics
  • ZnO

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