期刊名称：Journal of Materials and Environmental Science
印刷版ISSN：2028-2508
出版年度：2019
卷号：10
期号：5
页码：1-7
出版社：University of Mohammed Premier Oujda
摘要：The effect of a constant and a randomly oriented magnetic field H(ψ,φ), on the Néel
relaxation time τ, of an assembly of weakly interacting ultrafine ferromagnetic particles
with uniaxial anisotropy, is investigated. In this regard, the resolution of the FokkerPanck
equation (FPE) for the probability density W(θ,ϕ,t) of an assembly of ultrafine
ferromagnetic particles, with uniaxial anisotropy in the presence of an applied field
H(ψ,φ) was performed and published as a first part of this work; the results generalize
previous calculations, and give satisfactory interpretation of the relaxation phenomenon
in such system. In this part, calculation of the relaxation time, τ, is performed under the
assumption of weak interactions between particles. The derived expression of τ is in good
concordance with those previously obtained in the first part, and is consistent with those
of Coeffey et al. for high values of the anisotropy parameter.
