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No.1(pp.1-34)

Home > Issues > Volume 13 (2008) > No.1(pp.1-34)

Magnetic Properties of Transition Metal-implanted ZnO Nanotips Grown on Sapphire and Quartz

Journal of Magnetics, Volume 13, Number 1, 31 Mar 2008, Pages 19-22

Jeremy A. Raley(Department of Engineering Physics, Air Force Institute of Technology, Wright-Patterson AFB), Yung-Kee Yeo(Department of Engineering Physics, Air Force Institute of Technology, Wright-Patterson AFB), Robert L. Hengehold(Department of Engineering Physics, Air Force Institute of Technology, Wright-Patterson AFB), Mee-Yi Ryu*

(Department of Physics, Kangwon National University), Yicheng Lu(Department of Electrical and Computer Engineering, Rutgers University), Pan Wu(Department of Electrical and Computer Engineering, Rutgers University)

Abstract

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㎝^-2. The magnetic properties of these samples were measured using a superconducting quantum interference device (SQUID) magnetometer. Fe-implanted ZnO nanotips grown on c-Al₂O₃showed a coercive field width of 209 Oe and a remanent field of 12% of the saturation magnetization (2.3×10^-5_emu) at 300K for a sample annealed at 700℃ 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-Al₂O₃showed 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.

Keywords: ZnO nanotip; ferromagnetism; ion implantation; superconducting quantum interference device (SQUID)

DOI: 10.4283/JMAG.2008.13.1.19

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