Although the increment of the residual magnetism on the object after every cycle of magnetization - demagnetization process is very small , with the increase of the cycle index the object must be finally magnetized intensely and spontaneously 雖然每次磁化一退磁過(guò)程之后物體上的剩磁增量非常微小,但隨著循環(huán)次數(shù)的增加該物體最終必然被強(qiáng)烈地自發(fā)磁化。