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Updated: May 23, 2026

Writing and Low-Temperature Characterization of Oxide Nanostructures
Published on: July 18, 2014
Room temperature L1₀ phase transformation in binary CoPt nanostructures prepared by focused-electron-beam-induced
F Porrati1, E Begun, M Winhold
1Physikalisches Institut, Goethe-Universität, Max-von-Laue-Strasse 1, D-60438 Frankfurt am Main, Germany. porrati@physik.uni.frankfurt.de
Abstract:
CoPt-C binary alloys have been fabricated by focused-electron-beam-induced deposition by the simultaneous use of Co₂(CO)₈ and (CH₃)₃CH₃C₅H₄Pt as precursor gases. The alloys are made of CoPt nanoparticles embedded in a carbonaceous matrix. TEM investigations show that as-grown samples are in an amorphous phase. By means of a room temperature low-energy electron irradiation treatment the CoPt nanoparticles transform into face-centered tetragonal L1₀ nanocrystallites. In parallel, the system undergoes a transition from a superparamagnetic to a ferromagnetic state at room temperature. By variation of the post-growth irradiation dose the electrical and magneto-transport properties of the alloy can be continuously tuned.
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