The magnetic properties of oriented high anisotropy Nd(Fe,Co,Mo) 12Nx samples

The magnetic properties of a series of highly aligned Nd(Fe,Mo) ₁₂ and Nd(Fe,Co,Mo)₁₂ samples are measured before and after nitriding. The samples are synthesized as approximately 2-μm thick sputtered film samples with the crystalline c-axis aligned perpendicular to that film surface. Part of the Mo in the NdFe₁₁ Mo based ThMn₁₂ phase is replaced with Co to enhance the available flux density. The saturation flux density for H perpendicular to the film surface is 12.9 kG without Co replacement, and is 15.5 kG with 50% of the Mo replaced with Co. The films are uniaxial before and after nitriding. Upon nitriding, the anisotropy field at room temperature increases from 5 to 130 kOe. For a NdFe₁₁MoN_x sample with some excess Nd, the static energy product for measurements perpendicular to the film surface is 30.2 MGOe at 293 K, and 43.5 MGOe at 10 K. For NdFe₁₁Co_0.05Mo_0.5N_x the energy product at 293 K is 46.3 MGOe