Change of the equilibrium state of ferromagnetic MnBi by high magnetic fields

Bi–Mn Binary Phase Diagram in High Magnetic Fields

“…5. T p1 is found to increase linearly at a rate of 2 K T ¹1 for B¯18 T. The result obtained is consistent with previous HF-DTA experiments for the BiMn compound 1,17,18) and magnetization measurements for Bi6 mass%Mn. 16) Koyama et al reported that the linear increase in T p1 occurred for B¯20 T, but the T p1 -B curve deviates from linearity for B > 20 T. 1) Figure 6 shows the DTA curves of Bi24 at%Mn near T liq for several magnetic fields up to 18 T. The baseline change according to the liquidus boundary at T liq is observed to shift to higher temperature by applying stronger fields.…”

“…1) Furthermore, their results clearly showed that T p2 rises by ³5 K by applying a field of 45 T. 1) These results suggest that the form of BiMn binary phase diagram is controlled effectively by magnetic field, and new high quality materials of the BiMn alloy can be synthesized by high magnetic fields.…”

Thermodynamic Assessment of the Bi-Mn System

“…As the enthalpy change in the peritectic temperature at T P1 is ÁS ¼ 13 JÁmol À1 ÁK À1 , these sets of the parameters are consistent with the peritectic temperature changes [15][16][17][18][19][20] by a magnetic field.…”

“…14) Recently, phase diagram changes by means of a strong magnetic field have been reported. [15][16][17][18][19][20] On the basis of magnetic measurements, Liu et al reported that the peritectic temperature increased with an increase in the magnetic field. 15) Koyama et al also confirmed an increase in the peritectic temperature with an increase in the magnetic field at a rate of 2 K/T by using a differential thermal analysis technique.…”

“…15) Koyama et al also confirmed an increase in the peritectic temperature with an increase in the magnetic field at a rate of 2 K/T by using a differential thermal analysis technique. [16][17][18][19][20] To understand the solidification behavior of BiMn alloys, an understanding of the thermodynamic properties and the phase diagram of the Bi-Mn system is important. Thermodynamic assessment of Bi-Mn system was conducted by Wang et al 21) They mainly used the phase boundary data and ignored the available thermodynamic data.…”