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Coexistence of antiferromagnetic and ferromagnetic in Mn-doped anatase TiO2 nanowires

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Abstract

A series of Mn-doped TiO2 nanowires (NWs) were prepared by hydrothermal method at the mole fraction of Mn changing from 0 to 12.0%. X-ray powder diffraction (XRD) analysis shows that all the samples have pure anatase structure. SEM and TEM studies show that the diameter and the length of the Mn-doped TiO2 NWs are larger than those of the undoped TiO2 NWs. Energy dispersive X-ray spectroscopy (EDX) reveals that the samples are composed of Ti, Mn and O. According to magnetization measurements, all samples show ferromagnetic behavior, but only the undoped TiO2 NWs are completely ferromagnetic with a saturated magnetization about 1.0 mA·m2/kg. Mn-doped TiO2 samples exhibit antiferromagnetic and ferromagnetic (AF-FM) behaviors simultaneously. Photoluminescence (PL) spectra demonstrate the existence of MnO2 sublattice. These observations indicate that an AF-WF crossover is induced by the coexistence of TiO2 sublattice and MnO2 sublattice.

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Authors and Affiliations

  1. Department of Information Engineering, Shaoyang University, Shaoyang, 422000, China

    Hong-mei Li  (李红梅), Min Liu  (刘敏), Yang-su Zeng  (曾阳素) & Tong-cheng Huang  (黄同成)

  2. Institute of Laser and Information Technology, Shaoyang University, Shaoyang, 422000, China

    Hong-mei Li  (李红梅), Min Liu  (刘敏), Yang-su Zeng  (曾阳素) & Tong-cheng Huang  (黄同成)

Authors
  1. Hong-mei Li  (李红梅)
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  2. Min Liu  (刘敏)
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  3. Yang-su Zeng  (曾阳素)
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  4. Tong-cheng Huang  (黄同成)
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Corresponding author

Correspondence to Yang-su Zeng  (曾阳素).

Additional information

Foundation item: Project(06JJ2031) supported by Natrual Science Foundation of Hunan Province, China; Project(06A065) supported by Education Department of Hunan Province, China

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Li, Hm., Liu, M., Zeng, Ys. et al. Coexistence of antiferromagnetic and ferromagnetic in Mn-doped anatase TiO2 nanowires. J. Cent. South Univ. Technol. 17, 239–243 (2010). https://doi.org/10.1007/s11771-010-0037-z

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  • DOI: https://doi.org/10.1007/s11771-010-0037-z

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