Control growth of ultrathin 2D ferromagnetic manganese selenide nanosheets by chemical vapour deposition

• Main Author: Hou, Xiaohan
• Other Authors: Liu Zheng
• Format: Final Year Project
• Language: English
• Published: Nanyang Technological University 2020
• Subjects: Engineering::Materials
• Online Access: https://hdl.handle.net/10356/138589
• Institution: Nanyang Technological University

Two-dimensional (2D) magnetic crystals with intrinsic ferromagnetism are highly desirable for potential applications in future spin-electronic devices. However, the controllable synthesis of these 2D magnets, especially the direct growth on substrate surfaces, is still a great challenge. Here, we reported a moderate technique of chemical vapour deposition (CVD) to synthesize the ultrathin Nanosheets of ferrimagnet manganese selenide (MnSe) which possesses high-quality. For the significant observation, the CVD-grown 2D MnSe crystals perform distinct ferromagnetic properties with a Curie temperature (TC) around 50 K. Density functional theory (DFT) calculations suggest that the ferromagnetic order in zinc-blende (ZB) MnSe is originated from a spin coupling between the unsaturated Mn and Se atoms. This study represents a progress in the CVD growth of 2D magnetic materials and it has potential influence on energy-efficient information storage as well as processing to a certain extent.