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原先铁磁性化学物质中存有着许多的小地区，他们会自发性地被磁化到饱和。在玻璃吸盘电磁铁沒有外电磁场的情况下，这种自发性地被磁化了的地区——磁畴尽管每一个都是有一定的趋向，但从宏观经济的视角看来，他们却因为排序得很不规律而对外开放无法显示磁性。一旦这种磁畴处在外电磁场的功效下，他们便全部地转为，排序十分齐整，促使铁磁性化学物质明显地被磁化，直至饱和状态才行。假如把十分细的粉丝泼到抛光后已去磁的铁磁性化学物质的单晶体表层上，就可以根据粉的遍布观查到磁畴的界线。