New method for the reconstruction of the distribution of fine particle magnetic moments in a ferrofluid

Author

Berkov, D.V. ; Daum, A. ; Görnert, P. ; Buske, N. ; Gansau, C. ; Mueller, J. ; Giersig, M. ; Neumann, W. ; Su, D.

Author_Institution

INNOVENT, Jena, Germany

Volume

35

Issue

5

fYear

1999

fDate

9/1/1999 12:00:00 AM

Firstpage

4064

Lastpage

4066

Abstract

We present a new method to reconstruct the distribution of magnetic moments ρ(μ) of ferrofluid particles from the magnetization curve measured on a ferrofluid in the liquid state. The method employs the solution of the integral equation describing the magnetization of the fine particle system in an external field and requires no a priori assumptions concerning the shape of ρ(μ). Reconstruction results for both the computer simulated magnetization curves and the experimental data obtained on Co-ferrofluids are presented. In the latter case comparison of the reconstructed distribution with ρ(μ) calculated from the particle size distribution obtained via electron microscopy shows good quantitative agreement

Keywords

integral equations; magnetic fluids; magnetic moments; magnetisation; particle size; singular value decomposition; transmission electron microscopy; Co-ferrofluids; SVD regularization; TEM; computer simulated magnetization curves; electron microscopy; external field; ferrofluid; fine particle magnetic moments distribution; integral equation; liquid state; magnetization; magnetization curve; particle size distribution; reconstruction; Computational modeling; Computer simulation; Electrons; Integral equations; Magnetic field measurement; Magnetic liquids; Magnetic moments; Magnetization; Particle measurements; Shape;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.800756

Filename

800756