Title :
Cobalt Oxalate Formation on Thin-Film Magnetic Recording Media
Author :
Karis, T.E. ; Guo, X.C. ; Marchon, B. ; Raman, V. ; Hsiao, Y.-L.
Author_Institution :
Hitachi Global Storage Technol., San Jose, CA
Abstract :
Needle-like crystalline nanostructures were formed on the surface of a lubricated experimental thin-film media during exposure to elevated temperature and humidity. Clusters of nodules were formed on unlubricated media during the same exposure. Both the needles and nodules were identified as cobalt oxalate by Micro-Raman spectroscopy. A chemical mechanism is proposed to explain how cobalt hydroxide corrosion product and atmospheric oxalic acid combine to form cobalt oxalate in the presence of moisture
Keywords :
Raman spectroscopy; cobalt alloys; corrosion; disc drives; lubricants; magnetic recording; nanostructured materials; atmospheric oxalic acid; chemical mechanism; cobalt hydroxide corrosion product; cobalt oxalate formation; crystalline nanostructures; disk drives; lubricated media; magnetic disk; microRaman spectroscopy; thin film magnetic recording media; Cobalt; Crystallization; Humidity; Magnetic films; Magnetic recording; Nanostructures; Needles; Spectroscopy; Temperature; Transistors; Cobalt alloys; corrosion; disk drives; disks; magnetic disk;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2006.878629
