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Biotemplating Magnetic Nanoparticles on Patterned Surfaces for Potential Use in Data Storage

Published online by Cambridge University Press:  26 June 2013

Johanna M. Galloway,
Scott M. Bird,
Jonathan P. Bramble,
Kevin Critchley and
Sarah S. Staniland
Johanna M. Galloway*
Affiliation:
School of Physics and Astronomy, The University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK.
Scott M. Bird
Affiliation:
School of Physics and Astronomy, The University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK.
Jonathan P. Bramble
Affiliation:
School of Physics and Astronomy, The University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK.
Kevin Critchley
Affiliation:
School of Physics and Astronomy, The University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK.
Sarah S. Staniland
Affiliation:
School of Physics and Astronomy, The University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK.
*
*Email: j.m.galloway@leeds.ac.uk
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Abstract

Thin-films of magnetic nanoparticles (MNPs) with high coercivities are deposited onto surfaces for use in data storage applications. This usually requires specialist clean-room facilities, sputtering equipment and high temperatures to achieve the correct crystallographic phases. One possible cheaper and more environmentally friendly alternative could be to use biomolecules. Many biomineralization and biotemplating molecules have been identified that are able to template a wide range of technologically relevant materials using mild, aqueous chemistry under physiological reaction conditions. Here, we have designed a dual affinity peptide (DAP) sequence to template MNPs onto a surface. One end of the DAP has a high binding affinity for SiO2 and the other for MNPs of the L10 phase of CoPt, a high coercivity magnetic material. Images of the biomineralized substrates show that nanoparticles of CoPt are localized onto the areas that were functionalized with the biotemplating DAP. Magnetic force microscopy (MFM) plots of the biotemplated nanoparticles show that there is magnetic contrast on the patterned surface.

Keywords

biomimetic (chemical reaction)biomaterialmagnetic properties

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