The Nd Fe B/Co multilayer films were prepared by magnetron sputtering. After that, the samples were annealed at 600 ℃ for 20 min. The surface morphology, phase structures and magnetic properties of Mo（50 nm）/[Nd F...The Nd Fe B/Co multilayer films were prepared by magnetron sputtering. After that, the samples were annealed at 600 ℃ for 20 min. The surface morphology, phase structures and magnetic properties of Mo（50 nm）/[Nd Fe B（100 nm）/Co（y）]×10/Mo（50 nm） thin films were researched by AFM, XRD and VSM, respectively. The results show that the films show stronger perpendicular magnetic anisotropy. When the thickness of Co layers is 10 nm, the coercivity Hc⊥ is the maximum, 295 k A/m. However, for y=10-20, the reduced remanence M/Ms of films has increased. When the thickness of Co layers is 20-30 nm, the Nd Fe B/Co multilayer films obtained more superior magnetic properties with M/Ms =0.95.展开更多
The various adsorption states of oxygen on different sites of silver surfaces have been studied using CNDO method. The result shows that a fairly strong, adsorption bond is formed when oxygen molecule is adsorbed, in ...The various adsorption states of oxygen on different sites of silver surfaces have been studied using CNDO method. The result shows that a fairly strong, adsorption bond is formed when oxygen molecule is adsorbed, in lying down position with its axis parallel to the surface, at the surface bridge site having larger silver-silver distance. In this case, the adsorbed oxygen molecule has fairly strong tendency to dissociate. The most favorite sites on Ag（110） and Ag（111） surfaces for oxygen molecules or atoms to be adsorbed have been suggested after calculation and analysis. The differences of oxygen adsorption on these two surfaces mentioned above have been compared. The most stable adsorption states of oxygen are O<sub>2</sub><sup>2-</sup>, O<sup>2-</sup> on Ag（110） and O<sub>2</sub><sup>-</sup>, O<sup>-</sup>on Ag（111）. On silver film or polycrystalline silver, O<sub>2</sub><sup>2-</sup>, O<sub>2</sub><sup>-</sup>, O<sup>2-</sup>, O<sup>-</sup> may coexist. The results are in agreement with experiments.展开更多
文摘The Nd Fe B/Co multilayer films were prepared by magnetron sputtering. After that, the samples were annealed at 600 ℃ for 20 min. The surface morphology, phase structures and magnetic properties of Mo（50 nm）/[Nd Fe B（100 nm）/Co（y）]×10/Mo（50 nm） thin films were researched by AFM, XRD and VSM, respectively. The results show that the films show stronger perpendicular magnetic anisotropy. When the thickness of Co layers is 10 nm, the coercivity Hc⊥ is the maximum, 295 k A/m. However, for y=10-20, the reduced remanence M/Ms of films has increased. When the thickness of Co layers is 20-30 nm, the Nd Fe B/Co multilayer films obtained more superior magnetic properties with M/Ms =0.95.
基金Present address:Chemistry Department,South China University of Technology,Gusng Zhou,China
文摘The various adsorption states of oxygen on different sites of silver surfaces have been studied using CNDO method. The result shows that a fairly strong, adsorption bond is formed when oxygen molecule is adsorbed, in lying down position with its axis parallel to the surface, at the surface bridge site having larger silver-silver distance. In this case, the adsorbed oxygen molecule has fairly strong tendency to dissociate. The most favorite sites on Ag（110） and Ag（111） surfaces for oxygen molecules or atoms to be adsorbed have been suggested after calculation and analysis. The differences of oxygen adsorption on these two surfaces mentioned above have been compared. The most stable adsorption states of oxygen are O<sub>2</sub><sup>2-</sup>, O<sup>2-</sup> on Ag（110） and O<sub>2</sub><sup>-</sup>, O<sup>-</sup>on Ag（111）. On silver film or polycrystalline silver, O<sub>2</sub><sup>2-</sup>, O<sub>2</sub><sup>-</sup>, O<sup>2-</sup>, O<sup>-</sup> may coexist. The results are in agreement with experiments.
