Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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Magnetic Properties of Transition Metal-implanted ZnO Nanotips Grown on Sapphire and Quartz

  • Raley, Jeremy A. (Department of Engineering Physics, Air Force Institute of Technology, Wright-Patterson AFB) ;
  • Yeo, Yung-Kee (Department of Engineering Physics, Air Force Institute of Technology, Wright-Patterson AFB) ;
  • Hengehold, Robert L. (Department of Engineering Physics, Air Force Institute of Technology, Wright-Patterson AFB) ;
  • Ryu, Mee-Yi (Department of Physics, Kangwon National University) ;
  • Lu, Yicheng (Department of Electrical and Computer Engineering, Rutgers University) ;
  • Wu, Pan (Department of Electrical and Computer Engineering, Rutgers University)
  • Published : 2008.03.31
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Abstract

ZnO nanotips, grown on c-$Al_2O_3$ and quartz, were implanted variously with 200 keV Fe or Mn ions to a dose level of $5{\times}10^{16}cm^{-2}$. The magnetic properties of these samples were measured using a superconducting quantum interference device (SQUID) magnetometer. Fe-implanted ZnO nanotips grown on c-$Al_2O_3$ showed a coercive field width of 209 Oe and a remanent field of 12% of the saturation magnetization ($2.3{\times}10^{-5}emu$) at 300K for a sample annealed at $700^{\circ}C$ 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-$Al_2O_3$ 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.

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References

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