Coherent phonon study of (GeTe)<i>l</i>(Sb2Te3)<i>m</i> interfacial phase change memory materials
Coherent phonon study of (GeTe)<i>l</i>(Sb2Te3)<i>m</i> interfacial phase change memory materials
The time-resolved reflectivity measurements were carried out on the interfacial phase change memory (iPCM) materials ([(GeTe)2(Sb2Te3)4]8 and [(GeTe)2(Sb2Te3)1]20) as well as conventional Ge2Sb2Te5 alloy at room temperature and above the RESET-SET phase transition temperature. In the high-temperature phase, coherent phonons were clearly observed in the iPCM samples while drastic attenuation …