Electronic and Magnetic Properties of Ligand-Free FePt Nanoparticles


  • Financial support by the Deutsche Forschungsgemeinschaft (DFG) within SFB 569 and CFN Karlsruhe, the Bundesministerium für Bildung und Forschung (BMBF), the Center of Competence “Functional Nanostructures”, the Landesstiftung Baden-Württemberg, the Swiss National Science Foundation (NF), and the Swiss National Center of Competence in Research “Nanoscale Science” is gratefully acknowledged.


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Ligand-free FePt nanoparticles are prepared in densely packed arrays (see Figure) under ultrahigh vacuum conditions, in which oxygen and hydrogen plasmas are used to remove the organic shells that are present after particle synthesis. The electronic structure and magnetic properties of the “bare”, face-centered-cubic FePt particles are presented. Applications in high-density magnetic data recording are foreseen.