摘要
3d transition metal chalcogenides have attracted much attention due to their unique magnetic properties.Although various Cr,V,and Fe-based chalcogenides have been fabricated recently,the limited Curie temperature(T_C)still hinders their practical application.Based on the structural and magnetic advantages of MFe_(2)O_(4)and Fe_(3)Se_(4),we developed a one-pot solution synthesis method for the fabrication of NiFe_(2)Se_(4)nanostructures with structural continuity,to facilitate the investigation of their magnetic properties.Notably,the morphology of Ni Fe_(2)Se_(4)can be controlled from nano-rods to nano-platelets by controlling the growth direction.The coercivity(H_(C))of NiFe_(2)Se_(4)with nano-cactus structure exhibits a maximum of 12.77kOe at 5 K.The coercivity of ferrimagnetic NiFe_(2)Se_(4)nano-platelets can be further adjusted to 1.52 kOe at room temperature.These results show that the magnetic properties of NiFe_(2)Se_(4)can be significantly modified by controlling their morphologies.We also extend the method to the synthesis of Co Fe_(2)Se_(4)nano-cactus with an ultrahigh coercivity of 17.85 k Oe at 5 K.Obviously,the synthesis strategy and their excellent magnetic properties of MFe_(2)Se_(4)have sparked interest in ternary transition metal selenides as potential hard magnetic materials.
基金
supported by the National Natural Science Foundation of China(Nos.51971122,52371191,52301244)
the National Key R&D Program of China(No.2022YFB3505301)。
