#7023. Effect of Carbon Configuration on Mechanical, Friction and Wear Behavior of Nitrogen-Doped Diamond-Like Carbon Films for Magnetic Storage Applications

January 2027publication date
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Journal’s subject area:
Mechanical Engineering;
Mechanics of Materials;
Surfaces, Coatings and Films;
Surfaces and Interfaces;
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Abstract:
A high temperature mechanical and tribological study was performed to investigate the dependence of friction, wear and mechanical properties of ultra-thin nitrogen-doped diamond-like carbon (NDLC) films on their sp2/sp3 carbon configurations. Two NDLC films with the same thickness of 3 nm, almost the same nitrogen content, and different sp2/sp3 carbon ratios of 53% and 49% were deposited on FeCo/glass substrates. Heating to 300 °C led to partial reduction in sp3 carbon content of NDLCs, ending up with a softer layer. NDLC with 49% sp2/sp3 carbon ratio showed better mechanical properties at 300 °C and 25 °C before and after heat treatments, indicating that the lower the sp2/sp3 carbon ratio, the better the mechanical properties. The same NDLC also showed lower coefficient of friction because of lower sp2 carbon content. Wear tests revealed that NDLC with 49% sp2/sp3 carbon ratio also had better wear resistance at 300 °C because of improved mechanical properties. However, both NDLCs were not delaminated during wear tests at 300 °C and the average wear depths were less than 1 nm, which also indicated robustness and durability of the NDLC films.
Keywords:
Diamond-like carbon; Friction; HAMR; Head disk interface; Magnetic storage; Nitrogen doping; Wear

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