Abstract
Nano sized diamond-like carbon (DLC) films doped with nitrogen and hydrogen are materials of choice as a mechanical and corrosion protection barrier for magnetic layer of the computer hard disks. Overall thickness of a-C:N/a-C:H layer is bellow 2 nm and is usually accompanied by 0.5 nm thin flash layer of Cr. To obtain dense and voidfree DLC films, different plasma and ion beam sources operated with hydrocarbon gases are now replacing sputtering deposition techniques. For the film characterization, mainly used are non-destructive optical techniques like micro-Raman spectroscopy and optical surface analysis. Various electrochemical and business environmental tests are common for the corrosion protection evaluation. Capabilities of the Rutherford back-scattering spectroscopy have been demonstrated in revealing the cobalt migration from the magnetic layer. Incorporation of the tribology layer into the magnetic layer, either oxide, carbide or nitridebased, and improvement of the lubricant properties, are the main developmental area in the modern hard disk drive structures.
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