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Issue 1, 2013
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Templated assembly of Co–Pt nanoparticles via thermal and laser-induced dewetting of bilayer metal films

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Abstract

Templated dewetting of a Co/Pt metal bilayer film on a topographic substrate was used to assemble arrays of Co–Pt alloy nanoparticles, with highly uniform particle size, shape and notably composition compared to nanoparticles formed on an untemplated substrate. Solid-state and liquid-state dewetting processes, using furnace annealing and laser irradiation respectively, were compared. Liquid state dewetting produced more uniform, conformal nanoparticles but they had a polycrystalline disordered fcc structure and relatively low magnetic coercivity. In contrast, solid state dewetting enabled formation of magnetically hard, ordered L10 Co–Pt single-crystal particles with coercivity >12 kOe. Furnace annealing converted the nanoparticles formed by liquid state dewetting into the L10 phase.

Graphical abstract: Templated assembly of Co–Pt nanoparticles via thermal and laser-induced dewetting of bilayer metal films

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Publication details

The article was received on 26 Sep 2012, accepted on 06 Nov 2012 and first published on 23 Nov 2012


Article type: Paper
DOI: 10.1039/C2NR32932H
Citation: Nanoscale, 2013,5, 401-407
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    Templated assembly of Co–Pt nanoparticles via thermal and laser-induced dewetting of bilayer metal films

    Y. Oh, J. Kim, C. V. Thompson and C. A. Ross, Nanoscale, 2013, 5, 401
    DOI: 10.1039/C2NR32932H

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