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Influence of volume fraction on magnetodielectric effect in CoFe2O4–Ba0.8Sr0.2TiO3 multiferroic fluids

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Abstract

The multiferroic fluids use an external field to rotate the magnetization/polarization direction of the multiferroic particles to form a chain structure with a clamping effect, which is expected to achieve the enhanced magnetodielectric effect. In this paper, CoFe2O4–Ba0.8Sr0.2TiO3 multiferroic fluids were successfully prepared by ball milling method. The effects of volume fraction (0.1%, 0.5%, 1%, 2%, and 5%) on the magnetodielectric effect were systematically investigated. The analysis of X-ray diffraction patterns confirms that both CoFe2O4 and Ba0.8Sr0.2TiO3 particles were prepared in the pure phase. With the increase of the volume fraction, the dielectric properties and magnetodielectric effect increase slightly. When the volume fraction is 5%, the multiferroic fluids have a maximum ɛr of 6.44 at 100 Hz. Under the action of a 74.65 mT magnetic field, the maximum dielectric constant is 8.57, with the maximum magnetodielectric coefficient of 27.1%. Under the discontinuous magnetic field, the “switching effect” was also found. Moreover, the C–V curve demonstrates the nonlinear dielectric properties of multiferroic fluids.

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Acknowledgements

The present work has been supported by the Scientific and Technological Research Program of Chongqing Municipal Education Commission (KJZD-K20220150), the Program for Creative Research Groups in University of Chongqing (CXQT19031), the Chongqing Research Program of Basic Research and Frontier Technology (cstc2021jcyj–msxmX0008, cstc2021jcyj–msxmX0039, cstc2021jcyj–msxmX0599), the special project for technological innovation and application development of Chongqing Science and technology enterprises (cstc2021kqjscx–phxmX0008), the undergraduate technology innovation project of Chongqing University of Science and Technology (Grant Nos. 2023172, 2023176), the Postgraduate Technology Innovation project of Chongqing (Grant Nos. CYS23743), and the Postgraduate Technology Innovation Project of Chongqing University of Science and Technology (YKJCX2220222, YKJCX2220224).

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Authors and Affiliations

  1. School of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing, 401331, China

    Hong Ao, Chen Chen, Haowen Mu, Youlun Zhu, Yiwen Ding, Heng Wu, Rongli Gao, Xiaoling Deng, Wei Cai, Yilong Ma & Chunlin Fu

  2. Chongqing Key Laboratory of Nano/Micro Composite Materials and Devices, Chongqing, 401331, China

    Hong Ao, Chen Chen, Haowen Mu, Youlun Zhu, Yiwen Ding, Heng Wu, Rongli Gao, Xiaoling Deng, Wei Cai, Yilong Ma & Chunlin Fu

  3. School of Physics and Electronics, Qiannan Normal University for Nationalities, Duyun, 558000, China

    Gang Meng

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  1. Hong Ao
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Contributions

HA: writing—original draft, methodology, investigation, formal analysis, conceptualization. CC: writing—review and editing, investigation, formal analysis. HW: investigation, formal analysis, visualization. YZ: writing—review and editing, formal analysis, data curation. YD, HW: investigation, visualization. RG, XD, GM: writing—review and editing, supervision, project administration, funding acquisition. WC, CF, YM: writing—review and editing, supervision, project administration, resources.

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Correspondence to Gang Meng or Rongli Gao.

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Ao, H., Chen, C., Mu, H. et al. Influence of volume fraction on magnetodielectric effect in CoFe2O4–Ba0.8Sr0.2TiO3 multiferroic fluids. Appl. Phys. A 130, 182 (2024). https://doi.org/10.1007/s00339-024-07322-z

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