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Conference update
Papers from this year’s EIPBN (a.k.a. Beams) meeting are appearing on line [1]. Among others, the paper by Mankos et al. describing a new electron monochromator [2] caught my eye. The novel concept is to use a single knife-edge to scrape both sides of an energy-dispersed beam by reflecting the beam back on itself.
The proceedings from Microscopy and Microanalysis 2016 are also on line [3]. Since M&M is a huge conference, this runs to 53 screens listing titles, authors and DOI’s. In some ways it is easier to first download the program [4], available as a 72 page PDF.
References:
[1] JVST B 34(6)2016
[2] Mankos et al., “Novel electron monochromator for high resolution imaging and spectroscopy”, JVST B 34, 06KP01 (2016)
[3] Microscopy and Microanalysis, 22 (S3) 2016, Proceedings …
[4] M&M 2016 Scientific Program
Large-scale quantum chemistry
Nanotechnology has long depended on modeling for prediction and understanding. With this in mind, we looked some time ago at Large-scale computation of materials properties.
I would like to draw attention to a new review which appeared last week in preprint form (see reference below). It is largely devoted to delineating the realm of applicability of density functional theory (DFT). In this review, the authors take pains to highlight not only DFT’s place between near-exact calculations (applicable to very small systems) and classical methods (molecular mechanics, molecular dynamics) but also those techniques combining DFT with classical methods for very large, difficult systems (involving, for example, charge transfer over long time scales).
At 18 pages, with citations spanning the genesis of DFT around 1960 right up through the latest published developments in 2016, it is worth having a look.
Reference:
L E Ratcliff, S Mohr, G Huhs, T Deutsch, M Masella, L Genovese, “Challenges in Large Scale Quantum Mechanical Calculations”, arXiv:1609.00252.
Advance in bit patterned media
HGST reports (13 June 2016) using template-assisted epitaxial growth to create 1 Tdot / in2 bit-patterned media including servo patterning. The template is established by nano-imprinting on a carefully chosen materials stack such that subsequent processing induces oxide growth between platinum pillars, enhancing magnetic separation of the islands (bits) and ensuring single domains within each one. The pattern growth process takes advantage of both chemical and topological contrast.
Embedded servo patterning permits the final media to be manufactured without a separate servo writing step. The growth process results in topography favorable to flying head aerodynamics, while maintaining adequate magnetic contrast in the servo regions.
Reference: Yang et al., “Template-Assisted Direct Growth of 1 Td/in2 Bit Patterned Media”, Nano Lett. (2016), DOI: 10.1021/acs.nanolett.6b02345. [Also, arXiv:1606.05370.]
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