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Room-Temperature Magnetism in 2D MnGa4-H Induced by Hydrogen Insertion

Nan Wei,Liangcheng He,Changwei Wu,Dabiao Lu,Ruohan Li,Haiwen Shi,Haihui Lan,Yao Wen,Jun He,Youwen Long,Xiao Wang,Mengqi Zeng,Lei Fu

2D room-temperature magnetic materials are of great importance in future spintronic devices while only very few are reported. Herein, a plasma-enhanced chemical vapor deposition approach is exploited to construct the 2D room-temperature magnetic MnGa 4 -H single crystal with a thickness down to 2.2 nm. The employment of H 2 plasma makes hydrogen atoms can be easily inserted into the MnGa 4 lattice to modulate the atomic distance and charge state, thereby ferrimagnetism can be achieved without destroying the structural configuration. The as-obtained 2D MnGa 4 -H crystal is high-quality, air-stable, and thermo-stable, demonstrating robust and stable room-temperature magnetism with a high Curie temperature above 620 K. This work enriches the 2D room-temperature magnetic family and opens up the possibility for the development of spintronic devices based on 2D magnetic alloys.