urpose ofthis study is to perform a compaction romagnetic powder for optimizing magnetic ng magnetic recording medium or a permanent et. The magnetic powder is treated . A circular disk and an elliptical disk are employed as particle models. To simulate the behavior of the particles, a particle dynamics simulation is proposed, where Coulomb's law for magnetized particles, applied magnetic field, elastic repulsive force ian contact and friction force are considered. ip between the direction of the applied magnetic tion of the punch is examined. It is commonly con §~dered that easy directions of magnetiztion are oriented constantly in the direction of an applied magnetic field. However, the simulate^ results show that the particles are not aligned SO because of the interaction forces between the ~a~n e t~~e d particles.

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By implementing the magneto-Cosserat continuum theory in FEM scheme, it is possible to simulate magnetic alignment in powders with magnetic anisotropy during compaction in an applied magnetic field. We thereby analyze the relationship between the direction of magnetic field and compaction process, such as cross compaction and parallel compaction. The rotation of the axes is thus calculated at various conditions of applied magnetic field. In our previous study, Cosserat constant was given arbitrarily. The method to calculate the Cosserat constant is proposed and its effect on the rotation of the particles' easy axes is discussed. As a demonstration of the developed method, magnetic particles' alignment during compaction in an applied magnetic field is simulated. The calculated results are in good agreement with the experimental ones.

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