Seminar Abstract:
Efforts have increased towards the discovery of rare-earth-element (REE)-free permanent magnet materials due to the need for more sustainable alternatives to conventional REE-based magnets. However, the origins of permanent magnetism in transition-metal (TM)-based magnets remain largely unknown. Antiperovskite ternary nitrides, with the general formula M3AN, are a family of TM-based permanent magnets that offer promising insight. When M is an early transition metal, such as Fe or Mn, and A is a later transition metal or metalloid, such as Ge, Ga, or Sb, the crystal and magnetic structures are strongly dependent on the tunable nitrogen stoichiometry. Their complex magnetic behavior arises from frustrated M–M interactions within a kagome lattice, with nitrogen loss inducing additional structural and magnetic complexity. Here we investigate the influence of nitrogen stoichiometry on the structure and properties of three manganese ternary nitrides, with the aim of further understanding REE-free magnetism.
