Magnetic phase transition of MnBi under high magnetic fields and high temperature

Keiichi Koyama; Tetsuya Onogi; Yoshifuru Mitsui; Yuko Nakamori; Shin Ichi Orimo; Kazuo Watanabe

doi:10.2320/matertrans.MAW200721

Magnetic phase transition of MnBi under high magnetic fields and high temperature

Keiichi Koyama, Tetsuya Onogi, Yoshifuru Mitsui, Yuko Nakamori, Shin Ichi Orimo, Kazuo Watanabe

Tohoku University

Research output: Contribution to journal › Article › peer-review

28 Citations (Scopus)

Abstract

Magnetization measurements and differential thermal analysis (DTA) of poly crystalline MnBi were carried out in magnetic fields up to 14 T and in 300-773 K, in order to investigate the magnetic phase transition. The magnetic phase transition temperature (T_t) at a zero magnetic field is 628 K and linearly increases with increasing fields up to 14 T at the rate of 2 KT- '. A metamagnetic transition between the paramagnetic and field-induced ferromagnetic states was observed just above T_t. The exothermic and endothermic peaks were detected in the magnetic field dependence of DTA signals in 626-623 K, which relates to the metamagnetic transition. The obtained results were discussed on the basis of a mean field theory.

Original language	English
Pages (from-to)	2414-2418
Number of pages	5
Journal	Materials Transactions
Volume	48
Issue number	9
DOIs	https://doi.org/10.2320/matertrans.MAW200721
Publication status	Published - 2007 Sept

Keywords

Differential thermal analysis
First order transition
High magnetic field
Metamagnetic transition
MnBi compound

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10.2320/matertrans.MAW200721

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title = "Magnetic phase transition of MnBi under high magnetic fields and high temperature",

abstract = "Magnetization measurements and differential thermal analysis (DTA) of poly crystalline MnBi were carried out in magnetic fields up to 14 T and in 300-773 K, in order to investigate the magnetic phase transition. The magnetic phase transition temperature (Tt) at a zero magnetic field is 628 K and linearly increases with increasing fields up to 14 T at the rate of 2 KT- '. A metamagnetic transition between the paramagnetic and field-induced ferromagnetic states was observed just above Tt. The exothermic and endothermic peaks were detected in the magnetic field dependence of DTA signals in 626-623 K, which relates to the metamagnetic transition. The obtained results were discussed on the basis of a mean field theory.",

keywords = "Differential thermal analysis, First order transition, High magnetic field, Metamagnetic transition, MnBi compound",

author = "Keiichi Koyama and Tetsuya Onogi and Yoshifuru Mitsui and Yuko Nakamori and Orimo, {Shin Ichi} and Kazuo Watanabe",

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T1 - Magnetic phase transition of MnBi under high magnetic fields and high temperature

AU - Koyama, Keiichi

AU - Onogi, Tetsuya

AU - Mitsui, Yoshifuru

AU - Nakamori, Yuko

AU - Orimo, Shin Ichi

AU - Watanabe, Kazuo

PY - 2007/9

Y1 - 2007/9

N2 - Magnetization measurements and differential thermal analysis (DTA) of poly crystalline MnBi were carried out in magnetic fields up to 14 T and in 300-773 K, in order to investigate the magnetic phase transition. The magnetic phase transition temperature (Tt) at a zero magnetic field is 628 K and linearly increases with increasing fields up to 14 T at the rate of 2 KT- '. A metamagnetic transition between the paramagnetic and field-induced ferromagnetic states was observed just above Tt. The exothermic and endothermic peaks were detected in the magnetic field dependence of DTA signals in 626-623 K, which relates to the metamagnetic transition. The obtained results were discussed on the basis of a mean field theory.

AB - Magnetization measurements and differential thermal analysis (DTA) of poly crystalline MnBi were carried out in magnetic fields up to 14 T and in 300-773 K, in order to investigate the magnetic phase transition. The magnetic phase transition temperature (Tt) at a zero magnetic field is 628 K and linearly increases with increasing fields up to 14 T at the rate of 2 KT- '. A metamagnetic transition between the paramagnetic and field-induced ferromagnetic states was observed just above Tt. The exothermic and endothermic peaks were detected in the magnetic field dependence of DTA signals in 626-623 K, which relates to the metamagnetic transition. The obtained results were discussed on the basis of a mean field theory.

KW - Differential thermal analysis

KW - First order transition

KW - High magnetic field

KW - Metamagnetic transition

KW - MnBi compound

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Magnetic phase transition of MnBi under high magnetic fields and high temperature

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Keywords

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