Graphene overcoats for ultra-high storage density magnetic media
- Dwivedi, N.
- Ott, A. K.
- Sasikumar, K.
- Dou, C.
- Yeo, R. J.
- Narayanan, B.
- Sassi, U.
- Fazio, D. De
- Soavi, G.
- Dutta, T.
- Balci, O.
- Shinde, S.
- Zhang, J.
- Katiyar, A. K.
- Keatley, P. S.
- Srivastava, A. K.
- Sankaranarayanan, S. K. R. S.
- Ferrari, A. C.
- Bhatia, C. S.
DOIAbstract
Abstract: Hard disk drives (HDDs) are used as secondary storage in digital electronic devices owing to low cost and large data storage capacity. Due to the exponentially increasing amount of data, there is a need to increase areal storage densities beyond ~1 Tb/in2. This requires the thickness of carbon overcoats (COCs) to be <2 nm. However, friction, wear, corrosion, and thermal stability are critical concerns below 2 nm, limiting current technology, and restricting COC integration with heat assisted magnetic recording technology (HAMR). Here we show that graphene-based overcoats can overcome all these limitations, and achieve two-fold reduction in friction and provide better corrosion and wear resistance than state-of-the-art COCs, while ...
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