Raman scattering from Zn fine spheric particles coated with ZnO of variable thickness is measured, and a broad line can be found. The Raman line shifts to lower frequency side with the increase of oxide thickness. A t...Raman scattering from Zn fine spheric particles coated with ZnO of variable thickness is measured, and a broad line can be found. The Raman line shifts to lower frequency side with the increase of oxide thickness. A theoretical analysis based on the existence of surface phonon mode has been made. Agreement between experiment and theory is good.展开更多
An improved sputtering method,which is named "in situ oxidizing sputtering",was used to prepare periodic Ni/NiO multilayers.Samples studied in this letter contains 20 pairs of Ni/NiO with period about 100 A....An improved sputtering method,which is named "in situ oxidizing sputtering",was used to prepare periodic Ni/NiO multilayers.Samples studied in this letter contains 20 pairs of Ni/NiO with period about 100 A.In Raman scattering,the low frequency phonon modes are hiterpreted as LA phonon folding effect,which is usually measured in superlattices with a strict periodic structure.The ferromagnetic resonance spectra were also recorded at room temperature with microwave frequency 9.777 GHz.The analysis of spin wave resonance indicates that Ni sublayers are coupled with each other,which is the mechanism that surely relates to the amorphous-like NiO spacers.展开更多
基金the State Major Basic Research Project KNano-Materials Science*1(85-6 NMS)the National Natural Science Foundation of Chinathe National Advanced Materials Commit tee of China.
文摘Raman scattering from Zn fine spheric particles coated with ZnO of variable thickness is measured, and a broad line can be found. The Raman line shifts to lower frequency side with the increase of oxide thickness. A theoretical analysis based on the existence of surface phonon mode has been made. Agreement between experiment and theory is good.
基金Supported by the National Natural Science Foundation of Chinathe National Advanced Materials Committee of China。
文摘An improved sputtering method,which is named "in situ oxidizing sputtering",was used to prepare periodic Ni/NiO multilayers.Samples studied in this letter contains 20 pairs of Ni/NiO with period about 100 A.In Raman scattering,the low frequency phonon modes are hiterpreted as LA phonon folding effect,which is usually measured in superlattices with a strict periodic structure.The ferromagnetic resonance spectra were also recorded at room temperature with microwave frequency 9.777 GHz.The analysis of spin wave resonance indicates that Ni sublayers are coupled with each other,which is the mechanism that surely relates to the amorphous-like NiO spacers.
