Agradecimentos: This work was supported in part by Brazilian Funding Agency FAPESP Postdoctoral Fellowship under Process 2018/19096-1 and Thematic Project under Process 2017/10581-1 and in part by FONDECYT Postdoctoral Fellowship Award 3160170 Government of Chile

Abstract: Developing economically soft magnetic materials for high-performance electrical devices is indispensable. Here, we present the structural and magnetic properties of thermally reduced soft CuFe nanoparticles. The fcc cubic structure of iron-rich Cu37Fe63 and their composition was confirmed...

Abstract: Developing economically soft magnetic materials for high-performance electrical devices is indispensable. Here, we present the structural and magnetic properties of thermally reduced soft CuFe nanoparticles. The fcc cubic structure of iron-rich Cu37Fe63 and their composition was confirmed by Rietveld refinement. Cu37Fe63 nanoparticles exhibited high saturation magnetization and coercivity of 127 emu/g (142 emu/g) and 43 Oe (31 Oe), respectively, at 300 K (5 K). They showed transitions at similar to 34 and similar to 249 K due to the Kondo temperature of CuFe and minor fraction of CuFe2O4, respectively. The exchange coupling between Cu and Fe was not significant, as demonstrated by field-cooled magnetization curves at 5 K. The magnetocaloric effect (MCE) in the range of fields and temperatures was estimated whereas the maximum MCE of -8.71 x 10(-2) J.kg(-1).K-1 was achieved at 222 K. These soft magnetic materials, which exhibited stable high saturation magnetization with less heating effect during magnetization and demagnetization cycles, would he suitable candidates for magnetic applications

FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP

2017/10581-1; 2018/19096-1

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