摘要
采用磁控溅射方法制备了Ta(10nm)/NiFe(8nm)/Cu(2.6nm)/NiFe(3.6nm)/FeMn(9nm)/Ta(10nm)自旋阀多层膜.在Cu/NiFe界面沉积适量厚度的Bi原子能够有效地提高交换耦合场,沉积过量的Bi原子会导致交换耦合场下降.X射线光电子能谱分析结果表明:沉积在Cu/NiFe界面的Bi原子可以有效地抑制Cu原子在NiFe层表面的偏聚;当沉积过量的Bi原子时,Bi原子会进一步迁移到FeMn中,形成杂质,从而破坏了FeMn的反铁磁性,使交换耦合场降低.
Ta(10 nm)/NiFe(8 nm)/Cu(2.6 nm)/NiFe(3.6 nm)/FeMn(9 nm)/Ta(10 nm) spin valve multi-Myers were prepared by magnetron sputtering, It is found that an enhancement of exchange coupling field can he achieved by depositing a Bi layer with appropriate thickness at the Cu/NiFe interface. The results of X-ray photoelectron energy spectra show that the segregation of Cu atoms to the surface of the NiFe layer can he depressed effectively. Excessive Bi atoms can further migrate to the FeMn layer, which may produce lots of impurities. Consequently the ferromagnetism of the FeMn layer is damaged and the exchange coupling field is decreased.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2008年第5期517-521,共5页
Journal of University of Science and Technology Beijing
基金
国防基础研究项目(No.A1420060203)
国家自然科学基金资助项目(No.50671008
No.60471007)
关键词
表面活性剂
自旋阀多层膜
交换耦合场
X射线光电子能谱
surfactant
spin-valve multi-layers
exchange coupling field
X-ray photoelectron energy spectrum