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。 至此，磁学科技得到了飞速发展，强磁材料也使得元件更加小型化。 参考资料来源：. 鹦鹉可以自己留着。 宠物可以分为绿宠 (普通common)、蓝宠 (稀有rare)、金宠 (传说legendary)三种，售价分别是100、500、1000。 宠物带来的增益一般也可以分为三个等级，例如回城宠物.
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