磁壁移動および回転磁化を考慮した磁気弾性結合のシミュレーション

概要

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Numerical model for simulation of magnetoelastic interactions in polycrystalline ferromagnets is proposed. In ferromagnetic materials, individual grain is divided into many magnetic domains. In the demagnetized state, domains magnetized parallel to one of the easy axes are randomly distributed. When magnetic field or stress is applied, domain walls move and rotation magnetization starts to occur. In this study, change in the total volume of domains of each direction is calculated for every grain. Volume exchange between domains is assumed to be proportional to the difference of internal energy. The constant of proportionality is decided from the magnetization curve. Rotation magnetization is also introduced to the simulation. Magnetization direction of the most preferable domains is rotated so as to minimize the sum of internal energy. Results are compared with the experimental results, showing that stress dependence of magnetic properties can be predicted and that the effect of heat treatment can be explained by only two parameters.
2009-04-25