随后，20世纪50年代制造出了铁氧体 (ferrite),70年代制造出稀土磁铁 [rare earth magnet 包括钕铁硼 (ndfeb)和钐钴 (smco)]。 至此，磁学科技得到了飞速发展，强磁材料也使得元件更加. 稀土就是化学元素周期表中镧系元素——镧 (la)、铈 (ce)、镨 (pr)、钕 (nd)、钷 (pm)、钐 (sm)、铕 (eu)、钆 (gd)、铽 (tb)、镝 (dy)、钬 (ho)、铒 (er)、铥 (tm)、镱 (yb)、.
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