When the development of iron nitride magnets was announced years ago, the scientist at Ames claimed amazing intrinsic coercivity (resistance to demagnetization), now that is proven false, they are much lower IC than Neo magnets and even more subject to oxygen corroding the iron nitride.

The US military desires cobalt samarium rare earth magnets as they have no ferrous metals in their chemistry, so no corrosion near moisture or saltwater environments. They also resist demagnetization up to significantly higher temperatures. They are not as strong as Neo magnets, but still quite strong.