The investigation of multiply twinned L10-type FePt nanoparticles by transmission electron microscopy

• Published in: Philosophical magazine (Abingdon, England) Vol. 84; no. 20; pp. 2075 - 2081
• Main Authors: Kovács, A., Sato, K., Sáfrán, G., Barna, P. B., Hirotsu, Y.
• Format: Journal Article
• Language: English
• Published: Abingdon Taylor & Francis Group 11.07.2004; Taylor and Francis
• Subjects: Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Defects and impurities in crystals; microstructure; Exact sciences and technology; Grain and twin boundaries; Materials science; Nanopowders; Nanoscale materials and structures: fabrication and characterization; Physics; Structure of solids and liquids; crystallography; FCC lattices; Inorganic compounds; Electron diffraction; Platinum alloys; Iron alloys; Twinning; Experimental study; Thin films; Nanoparticles; Binary alloys; Twin boundaries; Transmission electron microscopy; Nanostructured materials; Transition element alloys
• ISSN: 1478-6435; 1478-6443
• DOI: 10.1080/14786430410001678172

Thin films of FePt nanoparticles were prepared by co-deposition of Fe and Pt on to amorphous C films kept at 350°C. As-prepared films were composed of disordered Fe-Pt nanoparticles with a fcc structure, where twinned and multiply twinned Fe-Pt nanoparticles could be identified by transmission electron microscopy (TEM) and electron diffraction. Atomic ordering from fcc to L1 0 structure was followed by in-situ TEM observation during heating up to 750°C. Multiply twinned (fivefold) nanoparticles of the L1 0 FePt were observed for the first time by high-resolution TEM observation. In these nanoparticles the crystallographic c axes of L1 0 structure is oriented parallel to the film plane in each segment. The stability of the fivefold FePt nanoparticles is briefly discussed.