The design of rewritable ultrahigh density scanning-probe phase-change memories

Wright, C. David and Wang, Lei and Shah, Purav and Aziz, Mustafa M. and Varesi, Enrico and Bez, Roberto and Moroni, Maurizio and Cazzaniga, Francesco (2011) The design of rewritable ultrahigh density scanning-probe phase-change memories. IEEE Transactions on Nanotechnology, 10 (4). pp. 900-912. ISSN 1536-125X

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Abstract

A systematic design of practicable media suitable for rewritable, ultrahigh density (>;1Tbit/sq.in.), high data rate (>;1Mbit/s/tip) scanning-probe phase-change memories is presented. The basic design requirements were met by a Si/TiN/Ge2Sb2Te5 (GST)/diamond-like carbon structure, with properly tailored electrical and thermal conductivities. Various alternatives for providing rewritability were investigated. In the first case, amorphous marks were written into a crystalline starting phase and subsequently erased by recrystallization, as in other already established phase-change memory technologies. Results imply that this approach is also appropriate for probe-based memories. However, experimentally, the successful writing of amorphous bits using scanning electrical probes has not been widely reported. In light of this, a second approach has been studied, that of writing crystalline bits in an amorphous starting matrix, with subsequent erasure by reamorphization. With conventional phase-change materials, such as continuous films of GST, this approach invariably leads to the formation of a crystalline “halo” surrounding the erased (reamorphized) region, with severe adverse consequences on the achievable density. Suppression of the “halo” was achieved using patterned media or slow-growth phase-change media, with the latter seemingly more viable.

Item Type: Article
Research Areas: A. > School of Science and Technology > Computer Science > SensoLab group
A. > School of Science and Technology > Computer and Communications Engineering
Item ID: 11175
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Depositing User: Teddy ~
Date Deposited: 05 Jul 2013 08:46
Last Modified: 07 Dec 2018 08:41
URI: http://eprints.mdx.ac.uk/id/eprint/11175

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