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.

doi:10.1038/s41467-021-22687-y

Title: Graphene overcoats for ultra-high storage density magnetic media

Journal Article · Mon May 17 00:00:00 EDT 2021 · Nature Communications

DOI:https://doi.org/10.1038/s41467-021-22687-y· OSTI ID:1815521

Dwivedi, N. ^[1]; Ott, A. K. ^[2]; Sasikumar, K. ^[3]; Dou, C. ^[4]; Yeo, R. J. ^[5]; Narayanan, B. ^[3]; Sassi, U. ^[4];

^[4]; Soavi, G. ^[4]; Dutta, T. ^[6];

^[4]; Shinde, S. ^[4]; Zhang, J. ^[4]; Katiyar, A. K. ^[4];

^[7]; Srivastava, A. K. ^[8]; Sankaranarayanan, S. K. R. S. ^[9];

^[4]; Bhatia, C. S. ^[10]

CSIR-Advanced Materials and Processes Research Institute, Bhopal (India); National Univ. of Singapore (Singapore). Dept. of Electrical and Computer Engineering
Univ. of Cambridge (United Kingdom). Cambridge Graphene Centre; Univ. of Exeter, Devon (United Kingdom). Dept. of Engineering
Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials
Univ. of Cambridge (United Kingdom). Cambridge Graphene Centre
National Univ. of Singapore (Singapore). Dept. of Electrical and Computer Engineering; Ecole Polytechnique Federale Lausanne (Switzerland). Inst. of Materials
National Univ. of Singapore (Singapore). Dept. of Electrical and Computer Engineering; Empa-Swiss Federal Laboratories for Material Science and Technology, Dübendorf (Switzerland)
Univ. of Exeter, Devon (United Kingdom). Dept. of Physics and Astronomy
CSIR-Advanced Materials and Processes Research Institute, Bhopal (India)
Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials; Univ. of Illinois, Chicago, IL (United States). Dept. of Mechanical and Industrial Engineering
National Univ. of Singapore (Singapore). Dept. of Electrical and Computer Engineering

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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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231; AC02-06CH11357

OSTI ID:: 1815521

Journal Information:: Nature Communications, Vol. 12, Issue 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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