| 摘要 |
PURPOSE:To improve coercive force, flux density, weight and dimensions by a method wherein a magnet is composed of a plurality of domains and each domain is composed of ferrite material which has the magnetic characteristics different from those of other domains. CONSTITUTION:A magnet is composed of at least two types of ferrite materials 1, 2 and the material 1 is so composed as it has larger coercive force and smaller residual flux density than the material 2. Notches 3 or a hole 4 are provided to the magnet and it can be fixed to a housing by screws or the like. With this constitution, the magnet which has a high demagnetizing force generated by the material 1 and a large flux density generated by the material 2 is obtained. |
