Abstract
This work focuses on the study of the magnetic and structural properties of chemically synthesized FePt1-xNix nanoparticles, with Ni content x in the range 0.2-0.4. We report the effect of Ni substitution on the L10 structure, on both the as-synthesized and annealed nanoparticles. A decrease in nanoparticle size as well as in chemical order is observed with an increase in Ni content, for both the as-made and annealed nanoparticles. The results also show that the post annealing procedure at 700oC significantly enhanced the L10 ordering of the nanoparticles. Substitution of nickel leads to a decrease in coercivity from 14.9 kOe in FePt to 0.8 kOe for FePt0.6Ni0.4 alloy, while the magnetization at 3 T is increased from 48 emu/g to 88 emu/g.
Highlights
FeNi prepared in the L10 phase has been suggested as a potential candidate for a rare earth free permanent magnet with theoretical energy product predictions of up to 42 MGOe comparable to some of the commercially available sintered NdFeB magnets.[1]
We report the effect of Ni substitution of Pt on the development of L10 structure of FePt nanoparticles synthesized chemically
The as-synthesized Fe0.5Pt0.5 alloy shows the presence of L10 structure but with a low degree of L10 ordering, as evident by the low intensity (001) and (110) superlattice peaks
Summary
FeNi prepared in the L10 phase has been suggested as a potential candidate for a rare earth free permanent magnet with theoretical energy product predictions of up to 42 MGOe comparable to some of the commercially available sintered NdFeB magnets.[1]. Most reports focus on the addition of a third element dopant keeping the stoichiometry between Fe and Pt fixed with the purpose of reducing ordering temperature.[17,18,19,20,21,22,23]
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