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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Patterned media ： ウィキペディア英語版 Patterned media Patterned media (also known as bit-patterned media or BPM) is a potential future hard disk drive technology to record data in magnetic islands (one bit per island), as opposed to current hard disk drive technology where each bit is stored in 20-30 magnetic grains within a continuous magnetic film. The islands would be patterned from a precursor magnetic film using nanolithography. It is one of the proposed technologies to succeed perpendicular recording due to the greater storage densities it would enable. ==Comparison with existing HDD technology== In existing hard disk drives, data is stored in a thin magnetic film. This film is deposited so that it consists of isolated (weakly exchange coupled) grains of material of around 8 nm diameter.〔Weller et al., L10 FePtX–Y media for heat-assisted magnetic recording, (2013), 210, 7, 1245-1260, Physica Status Solidi A〕 One bit of data consists of around 20-30 grains that are magnetized in the same direction (either "up" or "down", with respect to the plane of the disc). One method of increasing storage density has been to reduce the average grain volume. However, the energy barrier for thermal switching is proportional to the grain volume. With existing materials, further reductions in the grain volume would result in data loss occurring spontaneously due to superparamagnetism. In patterned media, the thin magnetic film is first deposited so there is strong exchange coupling between the grains. Using nanolithography, it is then patterned into magnetic islands. The strong exchange coupling means that the energy barrier is now proportional to the island volume, rather than the volume of individual grains within the island. Therefore storage density increases can be achieved by patterning islands of increasingly small diameter, whilst maintaining thermal stability.〔Ross, C.A.: "Patterned magnetic recording media"p 203-235. Annual Review of Materials Science, 2001: 31.〕 Patterned media is predicted to enable areal densities up to 20-300 Tb/in2 as opposed to the 1 Tb/in2 limit that exists with current HDD technology. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Patterned media」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.