ferromagnetic

詳細解釋：

fer.ro.mag.net.ic

adj.（形容詞）
Relating to or characteristic of substances such as iron, nickel, or cobalt and various alloys that exhibit extremely high magnetic permeability, the ability to acquire high magnetization in relatively weak magnetic fields, a characteristic saturation point, and magnetic hysteresis.
鐵磁的：具有類似鐵、鎳或鈷以及各種合金性質的或與此類物質有關的，具有在相對較弱的磁場裡獲得極高磁性的能力和特有的飽和點及磁滯現象

【引伸】
fer.romag.netism