nl8b05083_si_001.pdf (1.98 MB)
Chemical Ordering in Bimetallic FeCo Nanoparticles: From a Direct Chemical Synthesis to Application As Efficient High-Frequency Magnetic Material
journal contribution
posted on 2019-02-13, 00:00 authored by Cyril Garnero, Mathieu Lepesant, Cécile Garcia-Marcelot, Yooleemi Shin, Christian Meny, Pierre Farger, Bénédicte Warot-Fonrose, Raul Arenal, Guillaume Viau, Katerina Soulantica, Pierre Fau, Patrick Poveda, Lise-Marie Lacroix, Bruno ChaudretSingle-crystalline
FeCo nanoparticles with tunable size and shape
were prepared by co-decomposing two metal-amide precursors under mild
conditions. The nature of the ligands introduced in this organometallic
synthesis drastically affects the reactivity of the precursors and,
thus, the chemical distribution within the nanoparticles. The presence
of the B2 short-range order was evidenced in FeCo nanoparticles prepared
in the presence of HDAHCl ligands, combining 57Fe Mössbauer,
zero-field 59Co ferromagnetic nuclear resonance (FNR),
and X-ray diffraction studies. This is the first time that the B2
structure is directly formed during synthesis without the need of
any annealing step. The as-prepared nanoparticles exhibit magnetic
properties comparable with the ones for the bulk (Ms = 226 Am2·kg–1). Composite
magnetic materials prepared from these FeCo nanoparticles led to a
successful proof-of-concept of the integration on inductor-based filters
(27% enhancement of the inductance value at 100 MHz).