Advances in the extrinsic magnetic properties of SmFe12-based rare earth permanent magnetic materials
ThMn12-type SmFe12-based alloy,as a Fe-rich rare earth permanent magnet material,is considered a po-tential candidate for the next generation of rare earth permanent magnets due to its reduced rare earth usage and high intrinsic magnetic properties.The challenge of converting excellent intrinsic magnetic properties into practically use-ful extrinsic magnetic properties remains the major hurdle in developing high-performance SmFe12-based permanent magnets.Delves into the primary alloy forms of SmFe12-based permanent magnetic materials,summarizing the re-cent advances in extrinsic magnetic properties of SmFe12-based alloys in areas such as magnetron sputtering films,melt-spun ribbons,and bulk magnets.It provides an in-depth discussion on the formation mechanism of the SmFe12-based 1∶12 phase,the enhancement mechanisms of coercivity in alloy magnets,and the effects of internal phase composition and microstructure on magnetic performance.Finally,based on the insights gained,we propose a scheme and preparation method for obtaining high-performance SmFe12-based bulk magnets,aiming to offer valuable insights for the fabrication of high-performance SmFe12-based bulk permanent magnets.
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