Title :
Structural phase transformation of FePt nanoparticles by ion irradiation
Author :
Rellinghaus, O. ; Dmitrieva, O. ; Liedke, M.O. ; Fassbender, J.
Author_Institution :
IFW, Inst. fur Metallische Werkstoffe, Dresden, Germany
Abstract :
In the present study, post-deposition 5 keV He irradiation has been performed on such gas phase prepared FePt nanoparticles. Structural characterization of the samples is carried out by means of high resolution transmission electron microscopy (HRTEM). The power spectra obtained by Fourier transform of the original images clearly show that the particles are multiply twinned and of icosahedral structure but after irradiation, the particles are now of single crystal fcc structure and their mean diameter is reduced. This size reduction is ascribed to irradiation induced sputtering of the particles.
Keywords :
Fourier transform spectra; crystal structure; ion beam effects; iron alloys; magnetic particles; nanoparticles; particle size; platinum alloys; solid-state phase transformations; sputter deposition; transmission electron microscopy; twinning; 5 keV; FePt; Fourier transform; gas phase prepared nanoparticles; high resolution transmission electron microscopy; icosahedral structure; ion irradiation; power spectra; single crystal fcc structure; structural phase transformation; Fourier transforms; Helium; Magnetic anisotropy; Magnetic materials; Memory; Nanoparticles; Perpendicular magnetic anisotropy; Sputtering; Temperature; Thermodynamics;
Conference_Titel :
Magnetics Conference, 2005. INTERMAG Asia 2005. Digests of the IEEE International
Print_ISBN :
0-7803-9009-1
DOI :
10.1109/INTMAG.2005.1463521
