Since the discovery of perpendicular magnetic anisotropy in Mn₄N epitaxial films in 2012, Mn₄N has attracted much attention as a rare-earth free new spintronics material. The recent record velocity of current-induced magnetic wall motion achieved on Mn₄N and compensated Mn₄N microstrips at room temperature has attracted a great deal of attention, and spin transfer torques have renewed interest. Mn₄N shows interesting phenomena that magnetization and angular momentum compensation due to impurity doping occur at room temperature. It also has other very unusual properties such as a negative thermal expansion coefficient. In addition, a very large number of different kinds of mixed crystals have been formed. Specifically, they include Mn4N doped with various impurities (Fe, Co, Ni, Cu, Zn, Al, In, Ga, Ge, Sn, Pd, Ag, Sb, Pt, Au, Gd, and Dy).

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