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