Fabrication of High-performance Sm-Fe-N isotropic bulk magnets by a combination of High-pressure compaction and current sintering

► We conduct a consolidation of Sm1Fe7N bulk magnets without thermal decomposition. ► Rapid current sintering with high-pressure compaction is used as a low-thermal-load process. ► In this process, sintering occurs at a temperature of 400 °C, which is below the decomposition point. ► As a result, bulk magnets with a density of over 92% are obtained without decomposition. ► These magnets exhibit the highest (BH)max (16.2 MGOe) among isotropic Sm-Fe-N magnets.