Magnetic properties of MnBi in high magnetic fields and high temperature

Magnetization measurements of polycrystalline MnBi were carried out in magnetic fields up to 10 T and in the temperature range from 300 to 773 K, in order to clarify the magnetic properties under high magnetic fields and high temperature. The magnetic phase transition temperature (T _c) at a zero magnetic field is 633 K, which almost linearly increases by 2.3 KT ^-1 with increasing fields up to 10 T. Furthermore, a metamagnetic transition was observed just above T _c, indicating that the phase transition is first order. The magnetic entropy change is estimated to be 14 J kg ^-1 K ^-1 for 2 T at T _c using Clausius-Clapayron's equation, which is almost constant for magnetic fields up to 10 T.