The structure of Mn_xGe_(1-x) dilute magnetic semiconductor thin films prepared by magnetron co-sputtering has been studied by X-ray diffraction (XRD) and X-ray absorption fine structure (XAFS) techniques. The XRD results show that in the Mn_xGe_ 1-x thin film with low Mn doping concentration (x=0.070), only diffraction peaks attributed to crystalline Ge can be observed. In samples with high Mn doping concentrations (x=0.250, 0.360), the secondary phase Ge_3Mn_5 appears, and its content enhances with Mn dop...
【基金】
国家自然科学基金(批准号:10404023,10635060)资助的课题.~~
【更新日期】
2007-09-28
【分类号】
O471;O484
【正文快照】
1.引言稀磁性半导体(diluted magnetic semiconductor,DMS)是在半导体中掺杂低浓度的过渡金属离子(TM)而生成的磁性材料.由于稀磁性半导体材料是实现自旋电子学器件的重要材料,因此受到了人们的广泛关注[1,2].通过改变磁性杂质离子浓度和生长条件可以有效控制它们的光电、磁光?