PACS 75.50. Vv, 75.50.Ww This paper describes the relationship between magnetic properties and microstructure in Mn-Ni-N sintered alloys. The Mn-Ni-N alloy heat-treated at 1200 o C for 3 h and then jacket-quenched in a nitrogen atmosphere, exhibits a high coercivity of 352 kAm -1 . The EDX analysis reveals that the sample jacketquenched and then annnealed in nitrogen, consists of two phases with different Ni content forming a lamellar structure. From TEM observations, the jacket-quenched sample contains many stacking faults and twins with nano-meter size. Therefore, it is considered that they play a role as pinning sites of domain wall motion and high coercivity observed with the quenched sample is casued by the domain wall pinning mechanism.
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