Influences of surfactant Bi on the exchange coupling field and microstructure of spin-valve multilayers
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摘要: 采用磁控濺射方法制備了Ta(10nm)/NiFe(8nm)/Cu(2.6nm)/NiFe(3.6nm)/FeMn(9nm)/Ta(10nm)自旋閥多層膜.在Cu/NiFe界面沉積適量厚度的Bi原子能夠有效地提高交換耦合場,沉積過量的Bi原子會導致交換耦合場下降.X射線光電子能譜分析結果表明:沉積在Cu/NiFe界面的Bi原子可以有效地抑制Cu原子在NiFe層表面的偏聚;當沉積過量的Bi原子時,Bi原子會進一步遷移到FeMn中,形成雜質,從而破壞了FeMn的反鐵磁性,使交換耦合場降低.Abstract: 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.
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