Hard disk media is basically composed of a layered magnetic alloy stack for information storage, a protective layer that guards against impact and corrosion of the magnetic media, and a top lubricant layer that reduces friction and wear. After the various sputtered layer depositions, a microscopic (≤ 2nm thick) layer of lubricant is applied by dipping the disk into a solution containing a lubricant in solvent, spin coating or vacuum vapor deposition. The lubricant is typically composed of a PFPE perfluoropolyether (PFPE), a Teflon®-like polymer. This layer is then partially cured to stabilize the amount of bonded and unbonded material on the disk surface via thermal or UV curing. As new types of HDDs are commercialized, the chemistry and deposition technology for the lubricating layer is undergoing rapid evolution.
HDD industry leaders are working closely with Intevac in the development of new lubrication chemistries, to ensure their timely and cost-effective production.