Magnetic field is one of the key thermodynamic parameters such as temperature and pressure for controlling the equilibrium of condensed matters. Therefore, in order to discover and develop a new material, magnetic field effects on the magnetic phase transition, chemical reaction, solidification, etc. have been studied using high field magnets all over the world. However, it is very difficult to observe these phenomena in high temperature and high magnetic fields over 20 T using commercial equipment. In general, magnetic energy is quite small compared to thermal energy. For example, the magnetic energy of an electron spin with one Bohr magneton (μ_B) under a magnetic field B of 1 T corresponds to the temperature T of 0.67 K. This is a reason why high magnetic fields are needed for examining the magnetic field effects on materials over room temperature.
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