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 were measured before and after nitriding. The samples were synthesized as approximately 2 micrometer thick sputtered film samples with the crystallite c-axes aligned perpendicular to the film surface. Part of the Mo in the NdFe11Mo based ThMn12 phase was replaced with Co to enhance the available flux density. The saturation flux density for H perpendicular to the film surface was 12.9 kG without Co replacement, and was 15.5 kG with 50% of the Mo replaced with Co. The films were uniaxial before and after nitriding. Upon nitriding the anisotropy field at room temperature increased from 5 to 130 kOe. For a NdFe11MoNx sample with some excess Nd the static energy product for measurements perpendicular to the film surface was 30.2 MGOe at 293 K, and 43.5 MGOe at 10 K. For a NdFe11Co0.5Mo0.5Nx the energy product at 293 K was 46.3 MGOe. For this Co containing sample the room temperature HA was estimated to be 150 kOe. At 10 K the 4 Pi M(sub s) was 17.0 kG, the iHc was 24.0 kOe, and the energy product was 59.6 MGOe.