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 () still hinders their practical application. Based on the structural and magnetic advantages of MFeO and FeSe, we developed a one-pot solution synthesis method for the fabrication of NiFeSe nanostructures with structural continuity, to facilitate the investigation of their magnetic properties. Notably, the morphology of NiFeSe can be controlled from nano-rods to nano-platelets by controlling the growth direction. The coercivity () of NiFeSe with nano-cactus structure exhibits a maximum of 12.77 kOe at 5 K. The coercivity of ferrimagnetic NiFeSe nano-platelets can be further adjusted to 1.52 kOe at room temperature. These results show that the magnetic properties of NiFeSe can be significantly modified by controlling their morphologies. We also extend the method to the synthesis of CoFeSe nano-cactus with an ultrahigh coercivity of 17.85 kOe at 5 K. Obviously, the synthesis strategy and their excellent magnetic properties of MFeSe have sparked interest in ternary transition metal selenides as potential hard magnetic materials.

中文翻译：

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亚铁磁性NiFe2Se4纳米结构的可控合成及其优异的磁性


3d过渡金属硫属化物由于其独特的磁性而备受关注。尽管最近已经制备了各种Cr、V和Fe基硫属化物，但有限的居里温度()仍然阻碍了它们的实际应用。基于MFeO和FeSe的结构和磁性优势，我们开发了一种一锅溶液合成方法来制备具有结构连续性的NiFeSe纳米结构，以促进其磁性能的研究。值得注意的是，通过控制生长方向，可以控制 NiFeSe 的形貌从纳米棒到纳米片。具有纳米仙人掌结构的NiFeSe的矫顽力()在5 K时表现出最大12.77 kOe。亚铁磁性NiFeSe纳米片的矫顽力在室温下可以进一步调节至1.52 kOe。这些结果表明，通过控制 NiFeSe 的形貌可以显着改变其磁性能。我们还将该方法扩展到合成 CoFeSe 纳米仙人掌，在 5 K 下具有 17.85 kOe 的超高矫顽力。显然，MFeSe 的合成策略及其优异的磁性能引起了人们对三元过渡金属硒化物作为潜在硬磁材料的兴趣。