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Aligned CuO nanorod arrays: fabrication and anisotropic ferromagnetism

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Abstract

Copper oxide (CuO) is a p-type semiconductor with a band gap of 1.2 eV, which is well known in high-temperature superconductor and antiferromagnetic (AFM) materials through Cu–O–Cu super-exchange interaction. In this paper, we report the strong anisotropic ferromagnetism (FM) in aligned CuO nanorod arrays synthesized by a microwave-assisted hydrothermal method. The transmission electron microscopy (TEM) image shows that the CuO nanorod consists of a large number of smaller nanorods with almost the same growth direction. The X-ray diffraction (XRD) pattern indicates that the CuO nanorods are well crystallized with highly preferred orientation of the [020] direction. These CuO nanorod arrays show room-temperature ferromagnetism, with strong magnetic anisotropy when the magnetic field is applied perpendicular or parallel to the rod axis. This phenomenon of room-temperature ferromagnetism in those aligned CuO nanorods might originate from uncompensated surface spins and shape anisotropy of the nanorods.

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Acknowledgements

This work was supported by the Fundamental Research Funds for the Central Universities, the Foundation for Climax Talents Plan in Six Big Fields of Jiangsu Province, China (Grant No. 1107020070), and Large Equipment Grants of Southeast University, China.

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Authors and Affiliations

  1. Department of Physics and Key Laboratory of MEMS of the Ministry of Education, Southeast University, Nanjing, 210096, China

    Liqing Liu, Kunquan Hong, Xing Ge & Mingxiang Xu

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  1. Liqing Liu
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  2. Kunquan Hong
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  3. Xing Ge
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  4. Mingxiang Xu
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Correspondence to Kunquan Hong or Mingxiang Xu.

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Liu, L., Hong, K., Ge, X. et al. Aligned CuO nanorod arrays: fabrication and anisotropic ferromagnetism. Appl. Phys. A 115, 1147–1150 (2014). https://doi.org/10.1007/s00339-013-7958-y

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