Oxide nanolayer improving RRAM operational performance
The microstructure of CoO, the interface between CoO and electrodes, and the resistance switching in CoO have been investigated. The CoO film on the Pt electrode has quite dense crystallized grains and smooth surface, making it appropriate for the ultrahigh density non-volatile memory. About 5nm thick interfacial oxide nanolayer including Ta2O5 was confirmed at the CoO/Ta interface, which was spontaneously formed owing to the low oxygen potential of Ta. The low current resistance switching and operational stability in Pt/CoO/Ta are attributed to the interfacial layer acting as the embedded load resistance component in the forming process. The engineering for the nanoregion at the interface is crucial in order to improve the performance of the resistance switching random access memory.
switching resistance random access memory transition metal oxide thin film electron energy loss spectroscopy