Metal-Redox Synthesis of MnBi Hard Magnetic Nanoparticles

High coercivity MnBi alloy is a promising candidate as earth abundant permanent magnet for energy-critical technologies. We report here a new metal-redox method to synthesize colloidal MnBi nanoparticles, exhibiting a saturation magnetization of 49 emu/g and coercivity of 15 kOe. It is shown that the magnetic properties of the MnBi nanoalloys can be readily modified by precursor stoichiometry, temperature ramp rate, and reaction temperature, making it a versatile scalable strategy for generation of MnBi