Dose dependence of ferromagnetism in Co-implanted ZnO

We have studied the structural, magnetic and electronic properties of Co-implanted ZnO (0001) films grown on Al2O3 (1120) substrates for different implantation doses and over a wide temperature range. Strong room temperature ferromagnetism is observed with magnetic parameters depending on the cobalt...

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Bibliographic Details
Published in:arXiv.org 2008-07
Main Authors: Akdogan, Numan, Zabel, Hartmut, Nefedov, Alexei, Westerholt, Kurt, Becker, Hans-Werner, Safak Goek, Khaibullin, Rustam, Tagirov, Lenar
Format: Article
Language:English
Subjects:
Aluminum oxide
Cobalt
Dependence
Dichroism
Ferromagnetic materials
Ferromagnetic phases
Hall effect
Implantation
Magnetic properties
Magnetism
Substrates
Wave dispersion
Zinc oxide
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Summary:We have studied the structural, magnetic and electronic properties of Co-implanted ZnO (0001) films grown on Al2O3 (1120) substrates for different implantation doses and over a wide temperature range. Strong room temperature ferromagnetism is observed with magnetic parameters depending on the cobalt implantation dose. A detailed analysis of the structural and magnetic properties indicates that there are two magnetic phases in Co-implanted ZnO films. One is a ferromagnetic phase due to the formation of long range ferromagnetic ordering between implanted magnetic cobalt ions in the ZnO layer, the second one is a superparamagnetic phase, which occurs due to the formation of metallic cobalt clusters in the Al2O3 substrate. Using x-ray resonant magnetic scattering, the element specific magnetization of cobalt, oxygen and Zn was investigated. Magnetic dichroism was observed at the Co L2,3 edges as well as at the O K edge. In addition, the anomalous Hall effect is also observed, supporting the intrinsic nature of ferromagnetism in Co-implanted ZnO films.
ISSN:2331-8422
DOI:10.48550/arxiv.0807.4711