Change of the equilibrium state of ferromagnetic MnBi by high magnetic fields
Change of the equilibrium state of ferromagnetic MnBi by high magnetic fields
复制标题
DOI：
10.1016/j.jallcom.2010.11.082
复制
发表时间：
2011-02
影响因子：
6.2
通讯作者：
K. Koyama;Y. Mitsui;E. Choi;Yuki Ikehara;E. Palm;Kazuo Watanabe
中科院分区：
文献类型：
--
作者：
K. Koyama;Y. Mitsui;E. Choi;Yuki Ikehara;E. Palm;Kazuo Watanabe
在300- 773 K温度范围内，对MnBi铁磁材料在45 T磁场下的热分解过程进行了差热分析，研究了强磁场对其分解过程的影响，并绘制了相应的相图。当外加磁场为45 T时，MnBi→ Mn 1.08Bi+液态Bi的分解温度Tt由零场时的632 K提高到714 K。此外，在689 K附近的11.5- 45 T范围内观察到MnBi的磁热效应，表明发生了场致复合过程。结果表明，强磁场可以控制MnBi的平衡态。
Differential thermal analysis was carried out for ferromagnetic material MnBi in the temperature range 300–773K in magnetic fields up to 45T 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 632K (at a zero field) to 714K by applying a magnetic field of 45T. Furthermore, the magnetocaloric effect of MnBi is observed in 11.5–45T in the vicinity of 689K, 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.