TEM analysis of the 3 nm FePt nanoparticle before and after salt-matrix annealing: (a) and (b) HRTEM images of the particles before and after salt-matrix annealing, respectively; (c) STEM HDAAF image of the annealed particles; (d) and (e) SAED patterns of the particle before and after annealing, respectively.
(Color online) XRD patterns of the FePt nanoparticles before and after salt-matrix annealing. The pattern of the annealed film, which is made from the 3 nm nanoparticles, is also included for comparison.
(Color online) ZFC and FC curves of as-synthesized nanoparticles. The inset gives the ZFC curve of salt-annealed particles.
(Color online) Hysteresis loops of the salt-annealed at different temperature. The inset shows the hysteresis loops of the fcc nanoparticle before annealing.
(Color online) Temperature dependence of switching field and of the annealed 3 nm nanoparticles and the coercivity of the as-synthesized particles. The dashed line is the Kneller-Sharrock fitting of the data.
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