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Graphene overcoats for ultra-high storage density magnetic media.

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Dwivedi, N 
Ott, AK 
Sasikumar, K 
Dou, C 
Yeo, RJ 


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 withstanding HAMR conditions. Thus, we expect that graphene overcoats may enable the development of 4-10 Tb/in2 areal density HDDs when employing suitable recording technologies, such as HAMR and HAMR+bit patterned media.



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Nat Commun

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Springer Science and Business Media LLC


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Engineering and Physical Sciences Research Council (EP/K01711X/1)
Engineering and Physical Sciences Research Council (EP/K017144/1)
European Commission (309980)
European Commission Horizon 2020 (H2020) Future and Emerging Technologies (FET) (696656)
Royal Society of Chemistry (unknown)
European Commission Horizon 2020 (H2020) Future and Emerging Technologies (FET) (785219)
European Research Council (319277)
We acknowledge funding from the National Research Foundation, Prime Minister’s Office, Singapore un- der its Competitive Research Programme (CRP Award No. NRF-CRP 4-2008-06), the EU Graphene Flagship, EU grant CareRAMM, ERC Grant Hetero2D, EPSRC Grants EP/K01711X/1, EP/K017144/1, EP/N010345/1 and EP/L016057/1, EU grant Neurofibres, the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility, supported by the Office of Science of the U.S. Department of Energy under Contract DE-AC02-05CH11231, the Center for Nanoscale Mate- rials by the U.S. Department of Energy, Office of Sci- ence, Office of Basic Energy Sciences, under Contract DE-AC02-06CH11357.
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