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O: Fachverband Oberflächenphysik
O 23: [DS] Focused electron beam induced processing for the fabrication of nanostructures II (focused session, jointly with O – Organizers: Huth, Marbach)
O 23.4: Vortrag
Dienstag, 27. März 2012, 11:00–11:15, H 0111
Structural, electrical and magnetic properties of CoPt-C alloys prepared by focused electron-beam induced deposition — •Fabrizio Porrati1, Evgenyia Begun1, Marcel Winhold1, Roland Sachser1, Achilleas Frangakis2, and Michael Huth1 — 1Physikalisches Institut, Goethe Universität, Frankfurt am Main — 2Institut für Biophysik, Goethe Universität, Frankfurt am Main
CoPt-C binary alloys have been fabricated by focused electron beam-induced deposition with the simultaneous use of the Co2(CO)8 and (CH3)3CH3C5H4Pt 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 post-growth low-energy electron irradiation treatment the CoPt nanoparticles transform into face-centred tetragonal L10 CoPt nanocrystallites. In pararrel, the system undergoes a transition from a superparamagnetic to a ferromagnetic state at room temperature. By variation of the post-growth electron irradiation time the electrical- and magneto-transport properties of the alloy can be continuously tuned.