Partial cationic inversion-induced magnetic hardening of densely packed 23-nm-sized nanocrystallite-interacting nickel ferrite electrospun nanowires

Although the average crystallite size (23 nm) is very close to a critical radius of superparamagnetism, a magnetic hardening (coercive field and saturation magnetization) was observed in interacting single-domain nanogranular nickel ferrite electrospun nanowires as compared with the bulk. The phenom...

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Bibliographic Details
Published in:Applied physics letters 2013-12, Vol.103 (23)
Main Authors: Li, Jian-Min, Zeng, Xian-Lin, Xu, Zhu-An
Format: Article
Language:English
Subjects:
Anisotropy
Applied physics
Cations
Coercive force
Coercivity
Crystallites
Electrospinning
Hardening
Magnetic saturation
Nanocrystals
Nanostructure
Nanowires
Nickel ferrites
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Summary:Although the average crystallite size (23 nm) is very close to a critical radius of superparamagnetism, a magnetic hardening (coercive field and saturation magnetization) was observed in interacting single-domain nanogranular nickel ferrite electrospun nanowires as compared with the bulk. The phenomena can be attributed to a small change in the cation occupancy on the spinel sites from (Fe3+)A(Ni2+Fe3+)BO4 to [F1−δ3+Niδ2+] A[Ni1−δ2+Fe1+δ3+] BO4 (δ = 3.67%), and an additive interaction of the “chain of spheres” type. The larger shape anisotropy contribution (Keff = 8.24 × 104 erg/cm3) is also as a factor leading to enhanced coercive field.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4840320