Magnetic Properties of Fe-Implanted ZnO Nanotips Grown by Metal-Organic Chemical Vapor Deposition

被引：0
作者：
P. Wu
G. Saraf
Y. Lu
D.H. Hill
D.A. Arena
R.A. Bartynski
F. Cosandey
J.F. Al-Sharab
L. Wielunski
R. Gateau
J. Dvorak
A. Moodenbaugh
J.A. Raley
Yung Kee Yeo
机构：
[1] Rutgers University,Department of Electrical and Computer Engineering
[2] Rutgers University,Department of Physics and Astronomy, and Laboratory for Surface Modification
[3] Brookhaven National Laboratory,National Synchrotron Light Source
[4] Rutgers University,Department of Materials Science and Engineering
[5] Montana State University,Department of Physics
[6] Brookhaven National Laboratory,Department of Materials Science
[7] Wright-Patterson AFB,Air Force Institute of Technology
来源：
Journal of Electronic Materials | 2007年 / 36卷
关键词：
Spintronics; ferromagnetism; ZnO; implantation;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Fe ions were implanted into well-aligned single-crystal ZnO nanotips grown on SiO2/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 Fe2+ and Fe3+ ions in both as-implanted and annealed samples. However, Fe3+ 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.
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页码：529 / 532
页数：3
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