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Observation of room temperature ferromagnetism in pure La2O3 nanoparticles

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Abstract

In this paper, we report the observation of intrinsic room temperature ferromagnetism in pure La2O3 nanoparticles. Magnetism measurement indicates that all of the samples exhibit room temperature ferromagnetism and the saturation magnetization for the samples decreases with the increase in annealing temperature from 700 to 1,000 °C. X-ray photoelectron spectroscopy identifies the presence of oxygen vacancies in the La2O3 nanoparticles. The fitting results of the O 1s spectrum indicate that the variation of the oxygen vacancy concentration is in complete agreement with the change of the saturation magnetization. It is also found that the saturation magnetization of the La2O3 nanoparticles can be tuned by post-annealing in argon or oxygen atmosphere. These results suggest that the oxygen vacancies are largely responsible for the room temperature ferromagnetism in pure La2O3 nanoparticles.

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Acknowledgments

This work was supported by the National Basic Research Program of China (Grant No.2012CB933101), NSFC (Grant No. 11034004 and 51202101), the Specialized Research Fund for the Doctoral Program of Higher Education.

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Authors and Affiliations

  1. Key Laboratory for Magnetism and Magnetic Materials of MOE, Lanzhou University, Lanzhou, 730000, People’s Republic of China

    Qiang Xu, Daqiang Gao, Jing Zhang, Zhaolong Yang, Zhipeng Zhang, Jinwei Rao & Desheng Xue

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  1. Qiang Xu
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  2. Daqiang Gao
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  4. Zhaolong Yang
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Correspondence to Desheng Xue.

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Xu, Q., Gao, D., Zhang, J. et al. Observation of room temperature ferromagnetism in pure La2O3 nanoparticles. Appl. Phys. A 116, 1293–1298 (2014). https://doi.org/10.1007/s00339-014-8223-8

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  • DOI: https://doi.org/10.1007/s00339-014-8223-8

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