Detection of Single-Domain Co sub(2)FeAl Nanoparticles Using First-Order Reversal Curve Method

Half-Heusler nanostructures of Co sub(2)FeAl alloys, synthesized via coprecipitation route, were found to contain both hard- and soft-phases magnetic grains, mapped using first-order reversal curves (FORCs) diagrams. The obtained results confirmed that these powders are highly interacting as a singl...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2016-10, Vol.47 (10), p.5234-5241
Main Authors: Alikhanzadeh-Arani, Sima, Almasi-Kashi, Mohammad, Pezeshki-Nejad, Zahra, Ramazani, Abdolali, Salavati-Niasari, Masoud
Format: Article
Language:English
Subjects:
Alloys
Annealing
Grains
Nanoparticles
Nanostructure
Physical metallurgy
Scanning electron microscopy
Transmission electron microscopy
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Summary:Half-Heusler nanostructures of Co sub(2)FeAl alloys, synthesized via coprecipitation route, were found to contain both hard- and soft-phases magnetic grains, mapped using first-order reversal curves (FORCs) diagrams. The obtained results confirmed that these powders are highly interacting as a single-domain magnetizing system. A significant dependence of the morphology and particle size on the annealing rate was represented by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and high-resolution TEM images. The presence of the strong magnetizing interaction between the nanoparticles led to the formation of chain-like structure stabilized by PVP polymer. By increasing the annealing rate from 278.15 K/min to 288.15 K/min (5 degree C/min to 15 degree C/min), the grain shape changed from long nanochain to nonuniform agglomerated grains. Additionally, the magnetic characteristics of the prepared alloys were found to be affected by tuning the annealing rate.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-016-3662-9