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Electrochemical preparation and magnetic properties of Co–Cu nanometric granular alloy films

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Abstract

A detailed electrodeposition of Co–Cu nanometric granular alloy films in citrate solution has been performed based on a galvanostatic technique. Electrochemical behaviour of the bath solution containing both \(\hbox {Co}^{2+}\) and \(\hbox {Cu}^{2+}\) was investigated by linear sweep voltammetry. Cathodic polarization curves indicated that high quality Co–Cu nanometric granular alloy films can be obtained at room temperature with a pH of 6 and current density equal to or more negative than \(-\,1.0\hbox { mA cm}^{-2}\). Magnetic properties of the films were measured at room temperature by the physical property measurement system. Magnetization curves of the as-prepared Co–Cu nanometric granular alloy films displayed superparamagnetism (SPM). However, after annealing at \(450^{\circ }\hbox {C}\) for 1 h, magnetic property of the films changed from SPM to ferromagnetism. Meanwhile, the annealed Co–Cu nanometric granular alloy films showed an increase in saturation magnetization with the increase of the current density.

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Acknowledgements

This work is supported by the college science and technology research Project of Hebei Provincial Education Office (No. ZD2016079) and the National Natural Sciences Foundation of China (No. 51702083).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang, 050018, People’s Republic of China

    Huimin Zhang, Weiying Jia, Xin Zhang, Licong Guo & Jianwen Hu

  2. College of Physics Science and Information Engineering, Hebei Normal University, Shijiazhuang, 050024, People’s Republic of China

    Huiyuan Sun

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  1. Huimin Zhang
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  2. Weiying Jia
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  3. Huiyuan Sun
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  4. Xin Zhang
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Correspondence to Huimin Zhang.

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Zhang, H., Jia, W., Sun, H. et al. Electrochemical preparation and magnetic properties of Co–Cu nanometric granular alloy films. Bull Mater Sci 42, 103 (2019). https://doi.org/10.1007/s12034-019-1748-x

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