Study of magnetic properties and local structures in discontinuous-CoFe-ZnO multilayers
Study of magnetic properties and local structures in discontinuous-CoFe-ZnO multilayers
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DOI：
10.1109/tmag.2004.842085
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发表时间：
2005-02
影响因子：
2.1
通讯作者：
H. Hsu;J.C.A. Huang;L. Horng;C. Lee;Y. Huang;Y. Liao;M. Lin
中科院分区：
文献类型：
--
作者：
H. Hsu;J.C.A. Huang;L. Horng;C. Lee;Y. Huang;Y. Liao;M. Lin
在本研究中，我们研究了不连续Co/sub 70/Fe/sub 30/（x /spl Aring/）-ZnO多层膜的磁性和局域结构。通过测量Co或Fe K边的磁化强度随温度的变化和扩展X射线吸收精细结构（EXAFS），发现随着Co/sub 70/Fe/sub 30/名义厚度的变化，样品发生了从x=1 ML的稀磁半导体（DMS）相到x=5和9 ML的颗粒相的相变. Zn K边的EXAFS分析表明，Co配位数随CoFe厚度的增加而减少。这一结果表明，CoFe晶粒尺寸在DMS的形成中起着重要的作用，并且对于多层膜生长技术是非常关键的。
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.