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

被引：48

作者：

Koyama, Keiichi ^{[1
]}

Mitsui, Yoshifuru ^{[2
]}

Choi, Eun Sang ^{[3
]}

Ikehara, Yuki ^{[2
]}

Palm, Eric C. ^{[3
]}

Watanabe, Kazuo ^{[2
]}

机构：

[1] Kagoshima Univ, Grad Sch Sci & Engn, Kagoshima 8900065, Japan

[2] Tohoku Univ, High Field Lab Superconducting Mat, Inst Mat Res, Sendai, Miyagi 9808577, Japan

[3] Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32310 USA

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2011年 / 509卷 / 05期

关键词：

MnBi; High magnetic fields; Differential thermal analysis; Phase transition; Magnetocaloric effect;

D O I：

10.1016/j.jallcom.2010.11.082

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Differential thermal analysis was carried out for ferromagnetic material MnBi in the temperature range 300-773 K 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 T(t) (MnBi -> Mn(1.08)Bi + liquid Bi) increases from 632 K (at a zero field) to 714 K by applying a magnetic field of 45T. Furthermore, the magnetocaloric effect of MnBi is observed in 11.5-45T 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. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：L78 / L80

页数：3

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