Wang Juanjuan, Qin Bin, Li Huirong, Zhang Yuxin, Yang Huan, Wang Fang
Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education & School of Chemistry and Materials Science of Shanxi Normal University, Taiyuan 030032, China.
Department of Chemical and material Engineering, Lyuliang University, Lishi 033001, China.
Nanoscale. 2024 Oct 24;16(41):19298-19305. doi: 10.1039/d4nr02767a.
Ferromagnetic CrTe nanocrystals, with their high spin-orbit coupling and low symmetry, have attracted considerable attention as rare-earth-free magnetic nanomaterials due to their potential to achieve high magnetic anisotropy. However, their relatively low values of remanence () and saturation () magnetisation limit their energy product, making them unsuitable for practical applications. Herein, we report a straightforward one-pot heat-injection technique for the synthesis of high-remanence hexagonal CrTe nanosheets by heterogeneous doping with atoms of M (M = V, Mn and Se). The doped materials provide enhanced and at an unchanged Curie temperature (), resulting in excellent hard magnetic properties. With Mn doping, the Mr of the matrix increases significantly, reaching 18.38 emu g at 5 K, far exceeding the original undoped CrTe nanosheets. The nearly square hysteresis loop makes it valuable for many low temperature applications. These results provide a valuable case for tuning the magnetism of ferromagnetic CrTe by substitutional doping.
具有高自旋轨道耦合和低对称性的铁磁CrTe纳米晶体，因其具有实现高磁各向异性的潜力，作为无稀土磁性纳米材料已引起了广泛关注。然而，它们相对较低的剩磁（）和饱和（）磁化强度限制了其能量积，使其不适用于实际应用。在此，我们报道了一种简单的一锅热注入技术，通过用M（M = V、Mn和Se）原子进行异质掺杂来合成高剩磁的六方CrTe纳米片。掺杂后的材料在居里温度（）不变的情况下提高了剩磁和饱和磁化强度，从而产生了优异的硬磁性能。通过Mn掺杂，基体的剩磁在5 K时显著增加，达到18.38 emu g，远远超过原始未掺杂的CrTe纳米片。近乎方形的磁滞回线使其在许多低温应用中具有价值。这些结果为通过替代掺杂来调控铁磁CrTe的磁性提供了一个有价值的实例。
