世界上只有极少数的物质是铁磁性物质，比如铁钴镍等。
The world only a handful of ferromagnetic materials, such as material is iron cobalt nickel etc.
永磁体材料选自钕铁硼材料，铁磁性材料选自铁、镍或钴。
The permanent magnetic material is selected from NdFeB material, and the ferromagnetic material is selected from iron, nickel or cobalt.
所说具有铁磁性的加氢催化剂选自镍系非晶态合金、阮内镍或磁性载体负载的贵金属催化剂。
The ferromagnetic hydrogenating catalyst is selected from non-crystalline nickel alloy, Raney nickel or magnetic carrier loaded noble metal catalyst.
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