Study on the structure and magnetic properties of Gd-doped LTPMnBi
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RESEARCH PAPER
Study on the structure and magnetic properties of Gd-doped LTPMnBi Jinhui Huang & Wei He & Tonghan Yang & Guorui Xiao & Guoren Huang & Xiaowei Wu & Peiqi Chen
Received: 26 March 2020 / Accepted: 2 June 2020 # Springer Nature B.V. 2020
Abstract Series samples MnBi1-xGdx (x = 0, 0.04, 0.08, 0.12, and 0.16) were prepared and studied the structure and magnetic properties. The Rietveld refinement results showed that the low-temperature phase MnBi content in This article is part of the topical collection: Role of Nanotechnology and Internet of Things in Healthcare, Guest Editors: Florian Heberle, Steve bull and John Fitzgerald J. Huang : W. He (*) : T. Yang : G. Xiao : G. Huang : X. Wu : P. Chen Key Laboratory of New Processing Technology for Nonferrous Metal and Materials (Ministry of Education), School of Resources, Environment and Materials, and College of Chemistry & Chemical Engineering, Guangxi University, Nanning, China e-mail: [email protected]
J. Huang e-mail: [email protected]
these samples is above 78% and the doped atoms occupied the position of Bi in the MnBi crystal structure. The Debye temperature is founding to decrease with increasing doping. The Curie temperature, paramagnetic to ferromagnetic transition temperature, thermal hysteresis, saturation magnetization, and coercive force of the samples change significantly with increasing doping content. Within a temperature range of 300–500 K, a positive coercivity temperature coefficient β existed. This work helps MnBi-Gd as a candidate for high-temperature magnetic material applications and contributes to the development of tailoring magnetic properties. Keywords MnBi doping . Crystal structure . Debye temperature . Magnetic property . Magnetic material . Atomic structure . Magnetic nanomaterial
T. Yang e-mail: [email protected]
Introduction
G. Xiao e-mail: [email protected]
MnBi is a magnetic material with many unusual magnetic properties, such as permanent-magnet properties (high coercivity, high magnetic energy product), magneto-optical properties (Kerr effect), magneto caloric properties (magneto-caloric effect), and a magnetostrictive effect (Guo et al. 1990, 1991; Kishimoto and Wakai 1975). In addition, MnBi has a positive coercivity temperature coefficient from 150 to 550 K (Rama Rao and Hadjipanayis 2014; Kang et al. 2005; Yang et al. 2001). Therefore, MnBi has been the focus of researchers as a functional material, such as highperformance motors, low energy power electronics,
G. Huang e-mail: [email protected] X. Wu e-mail: [email protected] P. Chen e-mail: [email protected] W. He : T. Yang Guangxi Key Laboratory of Processing for Non-ferrous Metallic and Featured Materials, Guangxi University, Nanning, China
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Fig. 1 DSC curve for MnBi1-xGdx
and wind turbines (Li et al. 2013; Ly et al. 2014; Shen et al. 2015). Also, it is considered to have great potential as a permanent-magnet material and used as special-purpose permanent-magnet material (Cao et al. 2011), such as at a high temperature and in a
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