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The Exchange Bias Effect of CoFe2O4@NiO Core–Shell Nanofibers Based on Annealing Temperature

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Abstract

The exchange bias effect (HEB) has been studied in this work. The coaxial electrospinning technology is used to prepare nanofibers (NFs) with core–shell structure. The magnetic properties and HEB of CoFe2O4@NiO NFs are studied at different annealing temperatures (400, 450, 500, 550 and 600 °C). Its morphology and magnetic properties have been measured by XRD, SEM, HRTEM and VSM, respectively. The Hc and HEB increase first and then decrease, reaching the maximum value at the annealing temperature of 550 °C. Ms is 42.7 emu/g and Hc is 958Oe at 300 K. Ms is 47.2 emu/g, Hc is 12653 Oe, and HEB is 758 Oe at 5 K. With the increase in annealing temperature, the coupling effect at the interface is enhanced due to the change of distance between core and shell. The results in this work provide significant application in spintronic and magnetic recording devices.

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Acknowledgements

The authors are highly grateful for the support provided by the National Nature Science Foundation of China (No.11664023) and State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals of China.

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Authors and Affiliations

  1. School of Science, Lanzhou University of Technology, Lanzhou, 730050, China

    Wei Feng, Jianfeng Dai, Chen Cheng & Xinchao Wen

  2. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou, 730050, China

    Jianfeng Dai & Zengpeng Li

  3. Key Laboratory of Solar Power System Engineering, Vocational and Technical College Jiuquan, Jiuquan, 735000, China

    Zengpeng Li

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  1. Wei Feng
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Correspondence to Jianfeng Dai.

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Feng, W., Dai, J., Cheng, C. et al. The Exchange Bias Effect of CoFe2O4@NiO Core–Shell Nanofibers Based on Annealing Temperature. J Low Temp Phys 203, 55–64 (2021). https://doi.org/10.1007/s10909-021-02568-w

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