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物質產生磁性是因為量子效應的物理現象,在一般應用中以鐵磁性(Ferromagnetic)材料最具重要性,在週期表上106 個元素中僅有Fe鐵,Co鈷,Ni鎳, 3 個元素及稀土族的Gd釓在室溫時具有鐵磁性之表現
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