One-Pot Synthesis of Urchin-like FePd-Fe3O4 and Their Conversion into Exchange-Coupled L1(0)-FePd-Fe Nanocomposite Magnets

TitleOne-Pot Synthesis of Urchin-like FePd-Fe3O4 and Their Conversion into Exchange-Coupled L1(0)-FePd-Fe Nanocomposite Magnets
Publication TypeJournal Article
Year of Publication2013
AuthorsYu YS, Sun KW, Tian Y, Li XZ, Kramer MJ, Sellmyer DJ, Shield JE, Sun SH
Journal TitleNano Letters
Volume13
Pages4975-4979
Date Published10
Type of ArticleArticle
ISBN Number1530-6984
Accession NumberWOS:000326356300062
Keywordsenergy products, Exchange coupling, ferromagnetic fept nanoparticles, L1(0)-FePd, Nanocomposite magnets, nanocomposites, nanocrystals, phase, reductive annealing
Abstract

We report a one-pot synthesis of urchin-like FePd-Fe3O4 nano-composites, spherical clusters of FePd nanoparticles (NPs) with spikes of Fe3O4 nanorods (NRs), via controlled,thermal decomposition of Fe(CO)(3) and reduction of Pd(acac)(2). The FePd NPs with sizes between 6 and 9 nm self-aggregate into 60 nm superparticles (SPs), and Fe3Oi, NRs grow on the surface of these SPs. Reductive annealing at 500 degrees C converts the FePd-Fe3O4 into exchange-coupled nanocomposites L1(0)-FePd-Fe with their H-c tunable from 0.8 to 2.6 kOe and M-s controlled from 90 to 190 emu/g. The work provides a general approach to L1(0)-FePd-Fe nano composite 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.

URL<Go to ISI>://WOS:000326356300062
DOI10.1021/nl403043d