Skip to main content
placeholder image

Robust ferromagnetism of single crystalline CoxZn1−xO (0.3 ≤ x ≤ 0.45) epitaxial films with high Co concentration

Journal Article


Download full-text (Open Access)

Abstract


  • In contrast to conventional dilute magnetic semiconductors with concentrations of magnetic ions of just a few percent, here, we report the fabrication of epitaxial Cox Zn 1− xO single crystalline films with Co concentrations from x = 0.3 up to 0.45 by radio-frequency oxygen-plasma-assisted molecular beam epitaxy. The films retain their single crystalline wurtzite structure without any other crystallographic phase from precipitates, based on reflection high energy electron diffraction, X-ray diffraction, transmission electron microscopy, and Raman scattering. The results of X-ray diffraction, optical transmission spectroscopy, and in-situ X-ray photoelectron spectroscopy confirm the incorporation of Co2+ cations into the wurtzite lattice. The films exhibit robust ferromagnetism and the magneto-optical Kerr effect at room temperature. The saturation magnetization reaches 265 emu/cm3 at x = 0.45, which corresponds to the average magnetic moment of 1.5 μB per Co atom.

Authors


  •   Cao, Qiang
  •   Zhu, Dapeng (external author)
  •   Fu, Maxiang (external author)
  •   Cai, Li (external author)
  •   Yang, Ping (external author)
  •   Li, Shuang (external author)
  •   Zhu, Yinlian (external author)
  •   Ma, Xiuliang (external author)
  •   Liu, Guo-Lei (external author)
  •   Chen, Yan-Xue (external author)
  •   Yan, Shi-Shen (external author)
  •   Mei, Liang-Mo (external author)
  •   Wang, Xiaolin

Publication Date


  • 2016

Citation


  • Cao, Q., Zhu, D., Fu, M., Cai, L., Yang, P., Li, S., Zhu, Y., Ma, X., Liu, G., Chen, Y., Yan, S., Mei, L. & Wang, X. (2016). Robust ferromagnetism of single crystalline CoxZn1−xO (0.3 ≤ x ≤ 0.45) epitaxial films with high Co concentration. Applied Physics Letters, 109 (5), 052404-1-052404-5.

Scopus Eid


  • 2-s2.0-84981212714

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3195&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2174

Has Global Citation Frequency


Start Page


  • 052404-1

End Page


  • 052404-5

Volume


  • 109

Issue


  • 5

Place Of Publication


  • United States

Abstract


  • In contrast to conventional dilute magnetic semiconductors with concentrations of magnetic ions of just a few percent, here, we report the fabrication of epitaxial Cox Zn 1− xO single crystalline films with Co concentrations from x = 0.3 up to 0.45 by radio-frequency oxygen-plasma-assisted molecular beam epitaxy. The films retain their single crystalline wurtzite structure without any other crystallographic phase from precipitates, based on reflection high energy electron diffraction, X-ray diffraction, transmission electron microscopy, and Raman scattering. The results of X-ray diffraction, optical transmission spectroscopy, and in-situ X-ray photoelectron spectroscopy confirm the incorporation of Co2+ cations into the wurtzite lattice. The films exhibit robust ferromagnetism and the magneto-optical Kerr effect at room temperature. The saturation magnetization reaches 265 emu/cm3 at x = 0.45, which corresponds to the average magnetic moment of 1.5 μB per Co atom.

Authors


  •   Cao, Qiang
  •   Zhu, Dapeng (external author)
  •   Fu, Maxiang (external author)
  •   Cai, Li (external author)
  •   Yang, Ping (external author)
  •   Li, Shuang (external author)
  •   Zhu, Yinlian (external author)
  •   Ma, Xiuliang (external author)
  •   Liu, Guo-Lei (external author)
  •   Chen, Yan-Xue (external author)
  •   Yan, Shi-Shen (external author)
  •   Mei, Liang-Mo (external author)
  •   Wang, Xiaolin

Publication Date


  • 2016

Citation


  • Cao, Q., Zhu, D., Fu, M., Cai, L., Yang, P., Li, S., Zhu, Y., Ma, X., Liu, G., Chen, Y., Yan, S., Mei, L. & Wang, X. (2016). Robust ferromagnetism of single crystalline CoxZn1−xO (0.3 ≤ x ≤ 0.45) epitaxial films with high Co concentration. Applied Physics Letters, 109 (5), 052404-1-052404-5.

Scopus Eid


  • 2-s2.0-84981212714

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3195&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2174

Has Global Citation Frequency


Start Page


  • 052404-1

End Page


  • 052404-5

Volume


  • 109

Issue


  • 5

Place Of Publication


  • United States