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Dielectric Constant, Exchange Bias, and Magnetodielectric Effect in CrO2/Cr2O3 Nanostructures

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Abstract

The magnetodielectric effect has attracted considerable attention due to its intriguing physics and potential engineering applications in modern data storage, sensors, gyrators, and other novel low power electronic applications. Here, we investigate the dielectric behavior, exchange bias coupling, and magnetodielectric effect in nano-scaled CrO2/Cr2O3 core–shell structures. Importantly, our experiments have revealed interesting results whereupon the magnetodielectric effect and exchange bias coupling are strongly correlated in ferromagnetic and antiferromagnetic structures. It is notable that the magnetodielectric effect at room temperature can be enhanced from 1 to 3.5% with exchange bias coupling. Thus, the magnetodielectric effect is enhanced by as much as 250% with the assistance of exchange bias coupling. Results are interpreted here in terms of a spin-dependent transport model.

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Funding

This work was supported by the National Natural Science Foundation of China, grant no. 61107093; the Jiangsu Key Disciplines of Thirteenth Five-Year Plan, no. 20168765; and the Natural Science Foundation of the Jiangsu Higher Education Institutions of China, no. 19KJA140001. This work was also supported by Suzhou Key Laboratory for Low Dimensional Optoelectronic Materials and Devices (SZS201611).

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Authors and Affiliations

  1. Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application, School of Physical Science and Technology, Suzhou University of Science and Technology, Suzhou, 215009, China

    **aoyu Zhang & Yang Tan

  2. Center for Microwave Magnetic Materials and Integrated Circuits, and the Department of Electrical and Computer Engineering, Northeastern University, Boston, MA, 02115, USA

    Yajie Chen & Vincent G. Harris

  3. Innovation Center, Rogers Corporation, Burlington, MA, 01803, USA

    Yajie Chen

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  1. **aoyu Zhang
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  2. Yajie Chen
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Correspondence to **aoyu Zhang.

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Zhang, X., Chen, Y., Tan, Y. et al. Dielectric Constant, Exchange Bias, and Magnetodielectric Effect in CrO2/Cr2O3 Nanostructures. J Supercond Nov Magn 35, 1719–1725 (2022). https://doi.org/10.1007/s10948-022-06270-0

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  • DOI: https://doi.org/10.1007/s10948-022-06270-0

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