Magnetic Properties of MnBi Fine Particles Fabricated Using Hydrogen Plasma Metal Reaction

Abstract

Fine particles of MnBi were prepared by the hydrogen plasma metal reaction method and their magnetic properties were investigated. The particle size of the as-prepared MnBi particles was 70–950 nm with a median diameter of 269 nm. Heat treatment and ball milling with a dispersant improved the magnetic properties of the particles. The sample annealed at 330°C for 5 h in Ar then ball-milled for 10 min with a dispersant showed the largest energy product of 105 kJ·m⁻³ and a saturation magnetization of 71.0 Am²·kg⁻¹. High coercivity of 1380 kA·m⁻¹ was also obtained for the sample that was ball-milled for 2 h.