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

• Published in: IEEE transactions on magnetics Vol. 35; no. 5; pp. 4064 - 4066
• Main Authors: Berkov, D.V., Daum, A., Gornert, P., Buske, N., Gansau, C., Mueller, J., Giersig, M., Neumann, W., Su, D.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.09.1999; Institute of Electrical and Electronics Engineers
• Subjects: Computational modeling; Computer simulation; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electrons; Exact sciences and technology; Ferrofluids; Integral equations; Liquids; Magnetic field measurement; Magnetic liquids; Magnetic moment; Magnetic moments; Magnetic properties and materials; Magnetization; Magnetization curves; Mathematical analysis; Mathematical models; Particle measurements; Physics; Reconstruction; Shape; Studies of specific magnetic materials; Theoretical study; Ferromagnetic materials; Magnetic moments; Fine particle; Magnetic fluids; Magnetic properties
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/20.800756

We present a new method to reconstruct the distribution of magnetic moments /spl rho/(/spl mu/) 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 /spl rho/(/spl mu/). 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 /spl rho/(/spl mu/) calculated from the particle size distribution obtained via electron microscopy shows good quantitative agreement.