Study of magnetic properties and local structures in discontinuous-CoFe-ZnO multilayers

In this study, we have investigated the magnetic properties and local structures of discontinuous-Co/sub 70/Fe/sub 30/(x /spl Aring/)-ZnO multilayers (MLs). With the variation of Co/sub 70/Fe/sub 30/ nominal thickness, the phase transition from diluted magnetic semiconductor (DMS) phase, x=1 ML, to...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2005-02, Vol.41 (2), p.903-905
Main Authors: Hsu, H.S., Huang, J.C.A., Horng, L., Lee, C.H., Huang, Y.H., Liao, Y.F., Lin, M.Z.
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Diluted magnetic semiconductor (DMS)
discontinuous multiplayer
Electromagnetic wave absorption
Exact sciences and technology
extended X-ray absorption fine structure (EXAFS)
Fine structure
Grain size
Iron
Magnetic multilayers
Magnetic properties
Magnetic semiconductors
Magnetism
Magnetization
Materials science
Multilayers
Multilevel systems
Other topics in materials science
Phase measurement
Phase transformations
Physics
Temperature
Thickness measurement
X-rays
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Summary:In this study, we have investigated the magnetic properties and local structures of discontinuous-Co/sub 70/Fe/sub 30/(x /spl Aring/)-ZnO multilayers (MLs). With the variation of Co/sub 70/Fe/sub 30/ nominal thickness, the phase transition from diluted magnetic semiconductor (DMS) phase, x=1 ML, to granular phase, x=5, and 9 MLs, is indicated from the measurements of magnetization versus temperature behavior and extended X-ray absorption fine structure (EXAFS) on Co or Fe K-edge. The analysis of EXAFS at Zn K-edge shows the reduction of Co coordination numbers with the increasing CoFe thickness. This result demonstrates that the CoFe grain size plays an important role in the formation of DMS and is greatly critical for multilayer growth technique.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2004.842085