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Magnetic and microstructural properties of the assembly of Ni(C) nanoparticles

✍ Scribed by Xiang-Cheng Sun; J.Antonio Toledo

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
130 KB
Volume
2
Category
Article
ISSN
1567-1739

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✦ Synopsis

Superparamagnetic properties of the assembly of carbon encapsulated Ni nanoparticles (Ni(C) nanoparticles) with an average particle size of 10.5 nm are studied, the blocking temperature (T B ) is determined to around 115 K at l000 Gs applied field. Above T B , the magnetization MΓ°H ; T Þ can be described by the standard Langevin function L using the relation M=M S Γ°T ΒΌ 0Þ ΒΌ cothΓ°lH =kT Þ Γ€ kT =lH . Magnetization measurements suggest, this assembly of carbon encapsulated Ni nanoparticles have been exhibited typical single-domain, field-dependent superparamagnetic relaxation properties.

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