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Uniaxial magnetization performance of Co-Al2O3 nano-composite films electrochemically synthesized from acidic aqueous solution

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Abstract

In this study, Co-Al2O3 nano-composite films containing parallel-oriented cobalt nano-cylinders with length-to-diameter aspect ratios of ca. 4000 are synthesized to acquire a uniaxial magnetization property. The Co nano-cylinders were electrodeposited into anodized aluminum oxide films with numerous nano-channels under a low over-potential of less than 0.1 V using an acidic aqueous solution containing CoCl2 at 75 °C. The long axis of Co nano-cylinders, which are electrodeposited at cathode potential of −0.58 V vs. Ag/AgCl, coincides with the c axis of hexagonal close packed (hcp)-Co. The Co-Al2O3 nano-composite films show a uniaxial magnetization behavior due to the large shape anisotropy of Co nano-cylinders and the large magneto-crystalline anisotropy of the hcp-Co crystal structure. We achieved coercivity and squareness values of up to 2.4 and 1.0 kOe, respectively. This study shows an effective way to produce nano-composite films of altered coercivities.

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Acknowledgments

The authors thank New Energy and Industrial Technology Development Organization (NEDO P14015), Japan Science and Technology Agency (JST AS262Z02450K), and the Japan Society for the Promotion of Science (JSPS PE14005 and 15K06508) for the financial support.

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Authors and Affiliations

  1. Graduate School of Engineering, Nagasaki University, Bunkyo-machi 1-14, Nagasaki, 852-8521, Japan

    C. Neetzel, T. Ohgai, T. Yanai, M. Nakano & H. Fukunaga

  2. Kojimachi 5-3-1, Chiyoda-ku, Tokyo, 102-0083, Japan

    C. Neetzel

  3. Formerly: Technische Universität Darmstadt, Fachbereich Material- und Geowissenschaften, Alarich-Weiss-Strasse 2, 64287, Darmstadt, Germany

    C. Neetzel

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  1. C. Neetzel
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  2. T. Ohgai
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  3. T. Yanai
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  4. M. Nakano
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  5. H. Fukunaga
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Correspondence to C. Neetzel.

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Neetzel, C., Ohgai, T., Yanai, T. et al. Uniaxial magnetization performance of Co-Al2O3 nano-composite films electrochemically synthesized from acidic aqueous solution. J Solid State Electrochem 20, 1665–1672 (2016). https://doi.org/10.1007/s10008-016-3175-x

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  • DOI: https://doi.org/10.1007/s10008-016-3175-x

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