Directed self-assembly of block copolymers for use in bit patterned media fabrication

Rhys Alun Griffiths, Aled Williams, Chloe Oakland, Jonathan Roberts, Aravind Vijayaraghavan, Thomas Thomson

    Research output: Contribution to journalArticlepeer-review


    Reduction of the bit size in conventional magnetic recording media is becoming increasingly difficult due to the superparamagnetic limit. Bit patterned media (BPM) has been proposed as a replacement technology as it will enable hard disk areal densities to increase past 1 Tb in(-2). Block copolymer directed self-assembly (BCP DSA) is the leading candidate for forming BPM due to its ability to create uniform patterns over macroscopic areas. Here we review the latest research into two different BCP DSA techniques: graphoepitaxy and chemoepitaxy (or chemical prepatterning). In addition to assessing their potential for forming high density bit patterns, we also review current approaches using these techniques for forming servo patterns, which are required for hard disk drive (HDD) operation. Finally, we review the current state of UV nanoimprint lithography, which is the favoured technique for enabling mass production of BPM HDDs.
    Original languageEnglish
    Article number503001
    JournalJournal of Physics D: Applied Physics
    Issue number50
    Publication statusPublished - 2013


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