One-Pot Synthesis of Urchin-like FePd–Fe3O4 and Their Conversion into Exchange-Coupled L10–FePd–Fe Nanocomposite Magnets
Nano letters, 2013•ACS Publications
We report a one-pot synthesis of urchin-like FePd–Fe3O4 nanocomposites, spherical
clusters of FePd nanoparticles (NPs) with spikes of Fe3O4 nanorods (NRs), via controlled
thermal decomposition of Fe (CO) 5 and reduction of Pd (acac) 2. The FePd NPs with sizes
between 6 and 9 nm self-aggregate into 60 nm superparticles (SPs), and Fe3O4 NRs grow
on the surface of these SPs. Reductive annealing at 500° C converts the FePd–Fe3O4 into
exchange-coupled nanocomposites L10–FePd–Fe with their H c tunable from 0.8 to 2.6 kOe …
clusters of FePd nanoparticles (NPs) with spikes of Fe3O4 nanorods (NRs), via controlled
thermal decomposition of Fe (CO) 5 and reduction of Pd (acac) 2. The FePd NPs with sizes
between 6 and 9 nm self-aggregate into 60 nm superparticles (SPs), and Fe3O4 NRs grow
on the surface of these SPs. Reductive annealing at 500° C converts the FePd–Fe3O4 into
exchange-coupled nanocomposites L10–FePd–Fe with their H c tunable from 0.8 to 2.6 kOe …
We report a one-pot synthesis of urchin-like FePd–Fe3O4 nanocomposites, spherical clusters of FePd nanoparticles (NPs) with spikes of Fe3O4 nanorods (NRs), via controlled thermal decomposition of Fe(CO)5 and reduction of Pd(acac)2. The FePd NPs with sizes between 6 and 9 nm self-aggregate into 60 nm superparticles (SPs), and Fe3O4 NRs grow on the surface of these SPs. Reductive annealing at 500 °C converts the FePd–Fe3O4 into exchange-coupled nanocomposites L10–FePd–Fe with their Hc tunable from 0.8 to 2.6 kOe and Ms controlled from 90 to 190 emu/g. The work provides a general approach to L10–FePd–Fe nanocomposite magnets for understanding exchange coupling at the nanoscale. The concept may be extended to other magnetic nanocomposite systems and may help to build superstrong magnets for magnetic applications.
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