CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Equivalent circuit model including magnetic and thermo sources for the thermo–magneto–electric coupling effect in magnetoelectric laminates |
Cui Xiao-Le (崔晓乐), Zhou Hao-Miao (周浩淼) |
College of Information Engineering, China Jiliang University, Hangzhou 310018, China |
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Abstract The nonlinear thermo–magneto–mechanical magnetostrictive constitutive and the linear thermo–mechanical-electric piezoelectric constitutive are adopted in this paper. The bias magnetic field and ambient temperature are equivalent to a magnetic source and a thermo source, respectively. An equivalent circuit, which contains a magnetic source and a thermo source at the input, for the thermo–magneto–electric coupling effect in magnetoelectric (ME) laminates, is established. The theoretical models of the output voltage and static ME coefficient for ME laminates can be derived from this equivalent circuit model. The predicted static ME coefficient versus temperature curves are in excellent agreement with the experimental data available both qualitatively and quantitatively. It confirms the validity of the proposed model. Then the models are adopted to predict variations in the output voltages and ME coefficients in the laminates under different ambient temperatures, bias magnetic fields, and the volume ratios of magnetostrictive phases. This shows that the output voltage increases with both increasing temperature and increasing volume ratio of magnetostrictive phases; the ME coefficient decreases with increasing temperature; the ME coefficient shows an initial sharp increase and then decreases slowly with the increase in the bias magnetic field, and there is an optimum volume ratio of magnetostrictive phases that maximize the ME coefficient. This paper can not only provide a new idea for the study of the thermo–magneto–electric coupling characteristics of ME laminates, but also provide a theoretical basis for the design and application of ME laminates, operating under different sensors.
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Received: 16 October 2014
Revised: 05 February 2015
Accepted manuscript online:
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PACS:
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75.85.+t
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(Magnetoelectric effects, multiferroics)
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77.55.Nv
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(Multiferroic/magnetoelectric films)
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75.80.+q
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(Magnetomechanical effects, magnetostriction)
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77.65.-j
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(Piezoelectricity and electromechanical effects)
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11172285 and 11472259) and the Natural Science Foundation of Zhejiang Province, China (Grant No. LR13A020002). |
Corresponding Authors:
Zhou Hao-Miao
E-mail: zhouhm@cjlu.edu.cn
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Cite this article:
Cui Xiao-Le (崔晓乐), Zhou Hao-Miao (周浩淼) Equivalent circuit model including magnetic and thermo sources for the thermo–magneto–electric coupling effect in magnetoelectric laminates 2015 Chin. Phys. B 24 077506
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