| 简介 |
This invention provides a stacked permanent magnet, which can hold magnetization reversal of an alloy magnetic layer by strong demagnetization of superimposed large demagnetizing fields and can generate large surface magnetic flux density, and a process for producing the same. A motor having a reduced size provided by mounting the above stacked permanent magnet as a rotator or a stator is also provided. The stacked permanent magnet is produced by repeatedly stacking a rare earth metal layer formed of at least one metal selected from Dy and Tb, an (Nd, R)FeB layer, wherein R represents at least one rare earth metal selected from Dy and Tb, an alloy magnetic layer containing a tetragonal Nd2Fe14B, and an (Nd, R)FeB layer wherein R represents at least one rare earth metal selected from Dy and Tb. According to this constitution, the residual magnetic flux density and coercive force in a direction perpendicular to the plane of the alloy magnetic layer can be made larger than the in-plane direction of the alloy magnetic layer. |
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