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Change of the equilibrium state of ferromagnetic MnBi by high magnetic fields |
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| Authors: | Keiichi Koyama Yoshifuru MitsuiEun Sang Choi Yuki IkeharaEric C. Palm Kazuo Watanabe |
| Affiliation: | a Graduate School of Science and Engineering, Kagoshima University, Kagoshima, 890-0065, Japan b High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University, Sendai, 980-8577, Japan c National High Magnetic Field Laboratory, Florida State University, 1800 E. Paul Dirac Dr. Tallahassee FL 32310, USA |
| Abstract: | Differential thermal analysis was carried out for ferromagnetic material MnBi in the temperature range 300-773 K in magnetic fields up to 45 T to investigate the effect of high magnetic fields on its decomposition process and corresponding phase diagram. The decomposition temperature Tt (MnBi → Mn1.08Bi + liquid Bi) increases from 632 K (at a zero field) to 714 K by applying a magnetic field of 45 T. Furthermore, the magnetocaloric effect of MnBi is observed in 11.5-45 T in the vicinity of 689 K, showing that a field-induced composition process occurs. The obtained results show that the equilibrium state of MnBi can be controlled by a high magnetic field. |
| Keywords: | MnBi High magnetic fields Differential thermal analysis Phase transition Magnetocaloric effect |
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