The precise and consistent control over the size and shape of magnetic nanoparticles (MNPs) is critical for their reliable use in nanotechnological, biomedical and sensing applications. For novel high-density data-storage applications, such as bit patterned media, there is a requirement to pattern these MNP into precise nanoscale arrays. Furthermore, the ability to tailor these requirements under ambient, environmentally friendly synthesis conditions is a key goal.<br/>Pt alloys MNPs, in an ordered phase, are one of the few magnetic materials that have high enough magnetocrystalline anisotropy to remain magnetically stable at a few nanometres. Current methods to synthesise ordered phase Pt alloy MNPs use high temperature annealing (&lt; 650 °C). Biology can be used to overcome this problem. Previous work in the literature has identified peptides that show specificity to FePt and CoPt and when used in synthesis reactions produce MNPs with some degree of chemical ordering. Here we aim to improve on this work by using SPOT peptide array to technology to characterise these peptides and identify regions that are responsible for synthesis. From this new peptides have been generated that can be used in synthesis reactions and attached onto surfaces for the controlled formation of MNPs.<br/>There are a range of ambient condition, top-down patterned methods: from the microscale (microcontact printing) down to the nanoscale (interferometric lithography) that can be used to pattern proteins on surfaces. Here we report how we have married the top-down and bottom-up approaches to develop an environmentally-friendly methodology for producing precisely patterned arrays of MNPs on surfaces across the micro to nanometre length scale.

Production of magnetic nanoparticle arrays on surfaces from solution using top-down patterning and bottom-up biotemplating for future nanodevices

256th National Meeting (2018)

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