The melt spun Cu_(88)Co_(12) has obvious giant magnetoresistance(GMR)after annealed at 450℃ for 0.5h.By means of filed ion microscope with atom probe(FIM-AP),the spherical Co precipitates were clearly observed in thi...The melt spun Cu_(88)Co_(12) has obvious giant magnetoresistance(GMR)after annealed at 450℃ for 0.5h.By means of filed ion microscope with atom probe(FIM-AP),the spherical Co precipitates were clearly observed in this alloy for the first time.The average diameter of the particles is about 1.7nm in the specimen annealed at 450℃ for 2h,which has the highest GMR of 30.7% at 1.5K.By using both persistence size method and direct measurement method on micrographs from FIM,the size distribution of the Co particles was determined.These results are very useful for testing the present theory on the relationship between GMR and microstructure.展开更多
CNx films prepared by high dose ion implantation and post-annealing were studied by Auger electron spectroscopy,x-ray photoelectron spectroscopy and x-ray diffraction.A nearly uniform CNx layer was formed.Carbon and n...CNx films prepared by high dose ion implantation and post-annealing were studied by Auger electron spectroscopy,x-ray photoelectron spectroscopy and x-ray diffraction.A nearly uniform CNx layer was formed.Carbon and nitrogen were found covalently bonded in the films.X-ray diffraction results showed that two crystal phases of C_(3)N_(4),β-C_(3)N_(4) and p-C_(3)N_(4),have been formed in the matrix of carbon.展开更多
基金Suppurted by the National Natural Science Foundation of China under Grant No.59291002the State Ksy Laboratory on Magnetism.
文摘The melt spun Cu_(88)Co_(12) has obvious giant magnetoresistance(GMR)after annealed at 450℃ for 0.5h.By means of filed ion microscope with atom probe(FIM-AP),the spherical Co precipitates were clearly observed in this alloy for the first time.The average diameter of the particles is about 1.7nm in the specimen annealed at 450℃ for 2h,which has the highest GMR of 30.7% at 1.5K.By using both persistence size method and direct measurement method on micrographs from FIM,the size distribution of the Co particles was determined.These results are very useful for testing the present theory on the relationship between GMR and microstructure.
基金the National Natural Science Foundation of Chinathe State Education Commission of China.
文摘CNx films prepared by high dose ion implantation and post-annealing were studied by Auger electron spectroscopy,x-ray photoelectron spectroscopy and x-ray diffraction.A nearly uniform CNx layer was formed.Carbon and nitrogen were found covalently bonded in the films.X-ray diffraction results showed that two crystal phases of C_(3)N_(4),β-C_(3)N_(4) and p-C_(3)N_(4),have been formed in the matrix of carbon.
