With the development of society,the progress of science and technology,and the rapid development of green industry,higher requirements have been put forward for permanent magnet as basic functional materials.At present,the exist-ing rare-earth permanent magnets mainly include samarium-cobalt and neodymium-iron-boron magnet.The magnetic properties of samarium-cobalt magnet at room temperature are relatively low.However,the low Curie temperature of NdFeB permanent magnet is not suitable for high temperature applications,and its high coercivity depends heavily on heavy rare earth resources.The SmFe12-based permanent magnet with ThMn12 structure is one of the strong candidates for the development of new perma-nent magnet materials due to its excellent intrinsic magnetic properties,and has attracted the close attention of researchers in this field.This paper reviews the recent research on SmFe12-based permanent magnet with ThMn12 structure.First of all,the effect of element substitution on the intrinsic magnetic properties of SmFe12-based permanent magnetic compounds is con-cerned;Secondly,we focus on the progress in realizing the magnetic hardening of SmFe12-based permanent magnetic alloys.The research on magnetic hardening of SmFe12-based alloy is summarized from two aspects of nucleation theory and pinning theory.On this basis,the potential of SmFe12-based alloys as a practical permanent magnetic material is prospected to guide the future research and development direction.
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