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

Journal Article · Mon Jan 01 04:00:00 EST 2007 · Journal of Electronic Materials

DOI:https://doi.org/10.1007/s11664-007-0110-z· OSTI ID:929932

Wu, P; Saraf, G; Lu, Y; Hill, D; Arena, D; Bartynski, R; Cosandey, F; Al-Sharab, J; Wielunski, L

Fe ions were implanted into well-aligned single-crystal ZnO nanotips grown on SiO{sub 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{sup 2+} and Fe{sup 3+} ions in both as-implanted and annealed samples. However, Fe{sup 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.

• Research Organization: Brookhaven National Laboratory (BNL) National Synchrotron Light Source
• Sponsoring Organization: Doe - Office Of Science
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 929932
• Report Number(s): BNL--80526-2008-JA
• Journal Information: Journal of Electronic Materials, Journal Name: Journal of Electronic Materials Journal Issue: 4 Vol. 36; ISSN JECMA5; ISSN 0361-5235
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION SPECTROSCOPY
ANNEALING
CHEMICAL VAPOR DEPOSITION
ELECTRONS
ENERGY
ENERGY-LOSS SPECTROSCOPY
FERROMAGNETISM
IONS
MAGNETIC PROPERTIES
MAGNETIZATION
QUARTZ
SATURATION
SPECTROSCOPY
SQUID DEVICES
SUBSTRATES
SURFACES
TRANSMISSION ELECTRON MICROSCOPY
national synchrotron light source