X-ray absorption spectroscopy study of annealing effect on co-implanted ZnO epitaxial films

Y. F. Liao, T. W. Huang, J. C.A. Huang, C. H. Lee

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Room temperature diluted ferromagnetic semiconductor is a very promising candidate for spintronics applications. In this work, we present the cobalt ion implanted ZnO epitaxial thin film under controlled annealing temperature to investigate the origin of ferromagnetism in this system. For the as-implanted sample a metallic cobalt cluster was observed. After annealing at 700°C, the Co atoms were to substitute the Zn sites of the ZnO matrix and exhibited a spontaneous room temperature ferromagnetism. However the XMCD measurements on the annealed samples show the cobalt element is almost paramagnetism at 26 K. The result might indicate oxygen vacancies caused ferromagnetism of intrinsic dilute magnetic semiconductors in the sample of the Co-implanted ZnO.

Original languageEnglish
Article number4957814
Pages (from-to)2431-2434
Number of pages4
JournalIEEE Transactions on Magnetics
Volume45
Issue number6
DOIs
Publication statusPublished - 2009 Jun

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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