Two-Dimensional Manganese Nitride Monolayer with Room Temperature Rigid Ferromagnetism under Strain

Developing low-dimensional spintronic materials with room temperature magnetic ordering and large spin polarization is the key for the fabrication of practical spintronic devices with a high circuit integration density and speed. Here, first-principles calculations were performed to systematically investigate a two-dimensional hexagonal MnN monolayer with room temperature magnetic ordering and 100% spin polarization. The MnN monolayer is thermally, dynamically, and mechanically stable, and intrinsically half-metallic with a very wide band gap. The Curie temperature of the MnN monolayer is estimated to be 368 K, which is higher than room temperature and insensitive to strain. The MnN monolayer shows half metallic and excellent magnetic stability upon the external strain from-10 to 10%. Our calculations indicate that the MnN monolayer could be a promising material for room temperature spintronic devices.