There is a kind of special permanent magnetic mechanism-magic ring which is made up of permanent magnet segments with different magnetizationdirection.
永磁魔环是一种特殊的永磁机构,由若干充磁方向均匀变化的永磁块组成。
3
It is shown that exchange anisotropy results from the unidirectional anisotropy. And stress anisotropy has large effect on hard or easy magnetizationdirection.