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Growth and magnetic interaction of single crystalline Ni gradient–diameter magnetic nanowire arrays

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Abstract

Single crystalline Ni gradient–diameter magnetic nanowire arrays (GDMNWs) with different D/d (the diameter of thick end (D) and thin end (d) of GDMNWs) were successfully prepared by constant potential electrodeposition into a tapered anodic aluminum oxide template. The TEM images of samples illustrated that the obvious gradient–diameter nanowires had been obtained. The HRTEM, SAED images and XRD pattern demonstrated that the nanowire arrays grew with Ni single crystal structures. The magnetic interaction of GDMNWs was investigated by first-order reversal curves (FORCs) and δM(H) plots. The FORCs diagrams and δM(H) plots of different D/d ratio were compared and indicated that the magnetic interaction of GDMNWs with a thin end was dominated by dipolar interaction, and the thick end was dominated by exchange interaction. There was a gradient overlap effect in dipolar interaction and exchange interaction between the thin end and thick end. The spatial distributions of such unique magnetic interaction of GDMNWs were likely to produce entirely new physical characteristics of memory effect and tunable ferromagnetic resonance.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (51672248 and 51872261), Zhejiang Natural Science Foundation Outstanding Youth Science Foundation (LR19E020002) and Public Project of Zhejiang Province (2017C37067).

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Authors and Affiliations

  1. College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310014, China

    Jingcai Xu, Jing Wang & Jun Hu

  2. Magnetism Key Laboratory of Zhejiang Province, China Jiliang University, Hangzhou, 310018, China

    Jingcai Xu, Bo Hong, Xiaoling Peng, Xinqing Wang & Hongliang Ge

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  1. Jingcai Xu
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  2. Jing Wang
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Xu, J., Wang, J., Hong, B. et al. Growth and magnetic interaction of single crystalline Ni gradient–diameter magnetic nanowire arrays. J Mater Sci 54, 11538–11545 (2019). https://doi.org/10.1007/s10853-019-03694-3

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  • DOI: https://doi.org/10.1007/s10853-019-03694-3

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