论文部分内容阅读
Ta/NiO/NiFe/Ta multilayers were prepared by radio frequency reactive and dc magnetron sputtering. The exchange coupling field between NiO and NiFe reached 9.6×103 A/m. The compositions and chemical states at the interface region of NiO/NiFe were studied using the X-ray photoelectron spectroscopy (XPS) and peak decomposition technique. The results show that there are two thermodynamically favorable reactions at NiO/NiFe interface: NiO+Fe= Ni + FeO and 3NiO+2Fe =3 Ni+Fe203. The thickness of the chemical reaction area estimated by angle-resolved XPS was about 1-1.5 nm. These interface reaction products appear magnetic defects, and the exchange coupling field Hex and the coercivity Hc of NiO/NiFe are affected by these defects.
The exchange coupling field between NiO and NiFe reached 9.6 × 103 A / m. The compositions and chemical states at the interface region of NiO / NiFe were studied using the X-ray photoelectron spectroscopy (XPS) and peak decomposition technique. The results show that there are two thermodynamically favorable reactions at NiO / NiFe interface: NiO + Fe = Ni + FeO and 3NiO + 2Fe = 3 Ni + Fe203. The thickness of the chemical reaction area estimated by angle-resolved XPS was about 1-1.5 nm. These interface reaction products appear magnetic defects, and the exchange coupling field Hex and the coercivity Hc of NiO / NiFe are affected by these defects.