Journal
CERAMICS INTERNATIONAL
Volume 41, Issue 1, Pages 451-457Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2014.08.091
Keywords
ZnO; Diluted magnetic semiconductor; Hydrothermal method; Ferromagnetism; Pulsed magnetic field
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Funding
- Science and Technology Commission of Shanghai Municipality [11nm0501600]
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Pulse magnetic field-assisted hydrothermal method was used for the preparation of Cr-Ni codoped ZnO diluted magnetic semiconductors. XRD analysis reveals that all the samples have hexagonal wurtzite structure. HRTEM, EDS measurements and XPS results ensure that the divalent Cr and Ni ions have incorporated in the wurtzite host matrix without any detectable impurity phase formed. M H and ZFC/FC curves of the samples reveal the enhancement of ferromagnetism resulted from the magnetic field processing. XPS measurement and Raman scattering spectra indicate that the content of oxygen vacancies in the sample increases with pulse magnetic field processing. According to the bound magnetic polaron model, this may be the reason for the sample with magnetic field processing having better ferromagnetism than that without field processing. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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