Magnetic properties of transition metal-implanted ZnO nanotips grown on Sapphire and Quartz

Jeremy A. Raley, Yung Kee Yeo, Robert L. Hengehold, Mee Yi Ryu, Yicheng Lu, Pan Wu

Research output: Contribution to journalArticlepeer-review


ZnO nanotips, grown on c-Al2O3 and quartz, were implanted variously with 200 keV Fe or Mn ions to a dose level of 5 × 1016 cm-2. The magnetic properties of these samples were measured using a superconducting quantum interference device (SQUID) magnetometer. Fe-implanted ZnO nanotips grown on c-Al2O3 showed a coercive field width of 209 Oe and a remanent field of 12% of the saturation magnetization (2.3 × 10-5 emu) at 300 K for a sample annealed at 700°C for 20 minutes. The field-cooled and the zero-field-cooled magnetization measurements also showed evidence of ferromagnetism in this sample with an estimated Curie temperature of around 350 K. The Mn-implanted ZnO nanotips grown on c-Al2O3 showed superparamagnetism resulting from the dominance of a spin-glass phase. The ZnO nanotips grown on quartz and implanted with Fe or Mn showed signs of ferromagnetism, but neither was consistent.

Original languageEnglish (US)
Pages (from-to)19-22
Number of pages4
JournalJournal of Magnetics
Issue number1
StatePublished - 2008

All Science Journal Classification (ASJC) codes

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


  • Ferromagnetism
  • Ion implantation
  • Superconducting quantum interference device (SQUID)
  • ZnO nanotip


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