This study explores a novel arc-plasma sintering method for fabrication of magnetic phases in the manganese–bismuth (MnBi) alloy system with a 1:1 atomic ratio. The arc-plasma technique provides an innovative approach to sintering the intermetallic systems with elements exhibiting significantly different melting points, such as Mn (1246°C) and Bi (271.4°C). By adjusting the distance between the sample and the plasma source, temperatures up to 1250°C are rapidly reached in an argon atmosphere. Post-sintering annealing at 240°C for 4 and 24 hours influences significantly the magnetic properties of the material. Characterization is conducted using scanning electron microscopy, x-ray diffraction, and a vibrating sample magnetometer. This study highlights the potential of arc-plasma sintering as an efficient method for producing MnBi-based permanent magnets, offering a sustainable alternative to rare earth-based materials. The results demonstrate that optimizing the sintering process improves magnetic performance and enhances the structural integrity of the magnets. Further research into the microstructural transformations during annealing could provide valuable insights into the mechanisms driving these improvements. © 2026, G.V. Kurdyumov Institute for Metal Physics of N.A.S. of Ukraine. All rights reserved.