Structure Formation of Magnetic Particles under Magnetic Fields toward Anisotropic Materials

9th International Symposium on Electromagnetic Processing of Materials

材料科学;物理学

Ando, T.^1 ; Katayama, D.^1 ; Hirota, N.^2 ; Koike, O.^3 ; Tatsumi, R.^4 ; Yamato, M.^5

College of Industrial Technology, Nihon University, Narashino

275-8575, Japan^1

Fine Particle Engineering Group, National Institute for Materials Science, Tsukuba

304-0047, Japan^2

Products Innovation Association, Tokyo

113-8656, Japan^3

Environmental Science Center, University of Tokyo, Tokyo

113-8656, Japan^4

Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, Hachioji

192-0397, Japan^5

关键词: Anisotropic material;    Applied magnetic fields;    Chain-like cluster;    Magnetic particle;    Particle diameters;    Particle volume concentrations;    Simulation;    Structure formations;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/424/1/012076/pdf
DOI  :  10.1088/1757-899X/424/1/012076

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

We performed numerical simulation of structure formation of magnetic particles under magnetic field toward anisotropic material development. In this study, we examined the unsteady process of the structure formation and its feature using magnetic particles with diameter of micrometers. This study evaluated the process of structure forming with various particle diameters and particle volume concentrations using the Non-dimensional Boundary Area (NBA). The structure formed by the magnetic particles does not depend on the particle diameter but depends on the particle volume concentration. In the case of particle volume concentration φ = 5 vol%, the bundle of chain-like cluster is not made and each chain-like cluster by magnetic particles is almost single chain. However, in the case of more than φ = 10 vol%, the bundle structure formed by contacts of multiple chain-like clusters is proceeding. On the process of structure formation by magnetic particles, firstly, the single particle rotates by itself with orienting the magnetic moment to the direction of the applied magnetic field. After then, particles connect with each other and the chain-like cluster is formed.