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Magnetic and Structural Properties of MnBi_1-xTi_x Alloys

Journal of Magnetics, Volume 19, Number 3, 30 Sep 2014, Pages 205-209

Suyin Zhang (Magnetism Key Laboratory of Zhejiang Province, China Jiliang University), Pengyue Zhang *

(Magnetism Key Laboratory of Zhejiang Province, China Jiliang University), HuanChang Jiang (Magnetism Key Laboratory of Zhejiang Province, China Jiliang University), Yaojun Shi (Magnetism Key Laboratory of Zhejiang Province, China Jiliang University), Nengjun Yu (Magnetism Key Laboratory of Zhejiang Province, China Jiliang University), Hongliang Ge (Magnetism Key Laboratory of Zhejiang Province, China Jiliang University)

Abstract

MnBi_1-xTi_x (x = 0, 0.4, 0.7, 1) alloys were prepared by arc-melting, followed by heat treatment. X-ray diffraction (XRD) and vibrating sample magnetometer (VSM) were used to measure and investigate the phase structure and magnetic properties. The temperature dependent magnetization curves indicate that the phase transitions between LTP and HTP MnBi occur with heating or cooling in MnBi_1-xTi_x (x ≤ 0.7) samples. However, MnTi samples are in Mn₂Ti single-phase, with very low magnetic properties. Furthermore, the coercivity exhibits a positive temperature coefficient. The results show that the optimal content of Ti for the coercivity of MnBi_1-xTi_x alloy is x = 0.4. For MnBi sample, the coercivity reaches a maximum value of 1.13 T at 550 K. However, the remanence and energy product show apparent decrease with the addition of Ti in MnBi_1-xTi_x alloys.

Keywords: MnBi; phase transition; magnetic properties

DOI: http://dx.doi.org/10.4283/JMAG.2014.19.3.205

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