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Pursuing two-dimensional (2D) intrinsic ferromagnetism with high Curietemperature and great mechanical flexibility has attracted great interest inflexible spintronics. In the present work, we carried out a density functionaltheory (DFT) investigation on the 2D M2Se3 (M=Co, Ni and Pd) monolayers tounderstand their structural stabilities, electronic, magnetic and mechanicalproperties. Our results show that the Co2Se3 monolayer exhibits a fascinatinghalf-metallic ferromagnetism with high Curie temperature (>700K). In addition,due to their unique buckling hinge-like structure, M2Se3 monolayers possess thelarge out-of-plane negative Poisson's ratio (NPR) and superior mechanicalflexibility evidenced by their unusual critical strain two times greater thanthe well-known 2D materials. These findings imply that 2D M2Se3 family is thepromising materials for the applications in the flexible and high-densityspintronic nanodevices.

High Curie temperature half metallic 2D M2Se3 (M = Co, Ni, and Pd) monolayers with superior mechanical flexibility