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【多选题】
关于铁磁材料，下列说法正确的是（）
A.
电磁铁的是由软磁材料制成的
B.
将铁磁材料插入通电线圈，线圈中的磁通会大大增加
C.
铁磁材料的磁滞性，说明磁感应强度滞后于磁通的变化
D.
铁磁材料在反复磁化过程中存在磁滞损耗和涡流损耗
E.
只要有外磁场，就能使硬磁材料磁化
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