Co-containing and Pt-containing polymer blend to ferromagnetic CoPt NPs: Synthesis, characterization and patterning study by nanoimprint lithography

• A new method for the synthesis of ferromagnetic CoPt NPs was reported.
• A new pathway for the nanopatterned CoPt NPs in large scale and at low cost was provided.
• The method as demonstrated in the text can be used for generation of various nanopatternd metallic and metal alloy NPs.

Ferromagnetic (L10 phase) CoPt alloy nanoparticles (NPs) have attracted widely research interests due to their potential application in data storage, catalysis and biomedicine, etc. In this manuscript, we report the fabrication of L10 CoPt NPs by employing Co-containing and Pt-containing polymer blend as a single-source precursor without any post-annealing treatment. The average size of the resulting L10 CoPt NPs is 6.54 nm with a reasonably narrow size standard deviation of 1.28 nm. The coercivity of L10 CoPt NPs is 362 Oe and 1026 Oe at 300 K and 10 K, respectively. We also fabricated the nanoline and nanodot arrays through nanoimprinting the polymer blend which then underwent pyrolysis to generate L10 CoPt NPs-based nanoline array. The successful transfer of the pre-defined patterns of the stamps onto the surface of the polymer blend implies that this material holds great application potential in data storage system and electronics based on magnetic nanostructures.

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