Room‐temperature ferromagnetism enhancement in Fe‐doped VSe 2 nanosheets synthesized by a chemical method

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Two‐dimensional (2D) few‐layer VSe 2 , V 1− x Fe x Se 2 nanosheets have been synthesized by a high‐temperature organic solution‐phase method. The thickness of VSe 2 nanosheets can be tuned from 12 to 5 layers by decreasing the precursor concentrations. The few‐layer VSe 2 nanosheets show the room‐temperature ferromagnetism. The coercivity and magnetization reach 0.024 T and 0.036 mA·m 2 ·g −1 at room temperature. The charge‐density wave behavior is also confirmed in VSe 2 by the hysteresis loops and zero‐field‐cooling curve. V 1− x Fe x Se 2 nanosheets can be obtained by doping Fe(acac) 3 in the reaction process. The room‐temperature coercivity and magnetization of V 0.8 Fe 0.2 Se 2 nanosheets are 5 times higher than those of the pure VSe 2 nanosheets without destroying the structures. The enhancement of magnetization is due to the coupling interaction of 3d orbits between V and Fe atoms. Higher Fe concentration is beneficial to improve the coercivity, which is attributed to the formation of the second phase Fe 3 Se 4 . This simple chemical preparation method can be extended to prepare the other 2D materials.