A facile way to synthesize rare-earth-free Mn–Bi@Bi magnetic nanoparticles

Abstract

Rare-earth-free manganese bismuth (MnBi) is a promising candidate as an earth abundant permanent magnet for its large magnetocrystalline anisotropy and high energy density. A facile aqueous solution method was designed to synthesize MnBi@Bi nanoparticles, which exhibits a saturation magnetization of 2.37 emu g⁻¹, the coercivity of 8 kOe at 5 K and superparamagnetism at 300 K. This processing approach eliminates severe synthesis equipment and makes it a versatile scalable strategy for preparing MnBi nanoparticles.