Phase transition, structural and magnetic properties studied in Y doped low temperature phase MnBi

The MnBi1-xYx (x = 0, 0.04, 0.08, 0.12, and 0.16) series alloys were successfully prepared and their crystal structure, Debye temperature and magnetic properties were studied in this work. Using Rietveld crystal structure refinement to determine the low temperature phase MnBi content in the annealed alloy samples is over 79%, and it was determined that the doped Y atoms replaced the position of Bi in the crystal structure of MnBi. By Debye temperature calculation, it is found that the Debye temperature decreases as the doping content increases. The Curie temperature, paramagnetic to ferromagnetic transition temperature, thermal hysteresis, saturation magnetization and coercive force of the alloys changes significantly with increasing doping content, which helps to develop related research and application of rare earth-free permanent magnet materials, and can directly customize the relevant properties of materials.