PITA Fiscal Year 2007 Projects


Ordered Intermetallics for Ultrahigh Density Hard Disk Drives (HDD) and for Microelectromechanical Systems (MEMS)
Ordered intermetallics, i.e., metal compounds in which each chemical element occupies a specific crystal lattice site(s), are critical to the development of next generation (1 Tb/in2) magnetic recording media in hard disk drives (HDDs) and to microelectromechanical systems (MEMS). Manufacturing constraints on times and temperatures for atomic/chemical ordering necessitate the development of suitable alloy chemistries, compositions and thermal cycles. The aim of the proposed work is to go beyond the usual trial-and-error effort (of depositing, annealing and magnetically or mechanically characterizing alloy films) by providing the quantitative thermodynamic (energies) and kinetics (rates) needed in alloy development. The measured thermodynamic and kinetic parameters are incorporated into analytical phase transformation models that give technologists predictive tools for tailoring the thermal cycles used in the fabrication of engineered systems.