3-D simulation of magnetic particles' behaviour during compaction in a magnetic field

The alignment of anisotropic magnetic particles, each of which has its own easy axis for magnetization, has a great influence on the magnetic performa nce of the permanent magnet produced. It is, therefore, of great importance to study the behaviour of particles, how they move or rotate, during compa ction in an applied magnetic field. We develop and employ a non-spherical a xi-symmetric particle model. Magnetic polarization is given to each particl e when a magnetic field is applied. The particles are subjected to various types of compaction in a magnetic field. They are translated and rotated by not only mechanical forces but also magnetic forces. The rotation and alig nment of the easy axis are studied for various aspect ratios of the particl e. They are significantly influenced by the application of the magnetic fie ld and type of compaction. The results are discussed comparing with existin g experimental data. (C) 2000 Elsevier Science S.A. All rights reserved.