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Local Structure and Room Ferromagnetism of Fe-Doped LiNbO3 Films

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Abstract

Fe-doped LiNbO3 thin films were deposited on Si (111) substrates by RF magnetron sputtering technique. The X-ray absorption spectroscopy (XAS) at Fe K-edge revealed the incorporation of Fe ions into Nb sites in the LiNbO3 host lattice with Fe3+ and Fe2+ mixed-valent state. The local structural analysis also confirmed that oxygen vacancies are present in the nearest coordination shell of the Fe atoms. The SQUID results showed that all films exhibited room temperature ferromagnetism and the maximum magnetic moment was found when the Fe-doped concentration is 7 at%. The observed room temperature ferromagnetism of Fe-doped LiNbO3 films could be ascribed to the super-exchange interactions of pentahedral-pentahedral and pentahedral-octahedral Fe3+ ions mediated by the oxygen ions, as well as the double-exchange interactions based on the Fe2+-O2−-Fe3+ pairs. Our results demonstrated that the room temperature ferromagnetism can be activated in LiNbO3 ferroelectrics by introducing transition metal impurities.

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Funding

This work was supported by the National Natural Science Foundation of China (Grant No. 51702380), the Key R&D and Promotion Projects of Henan Province (Grant Nos. 222102230006 and 202102210197), and Student Research Training Program of Zhoukou Normal University (Grant Nos. S202110478022 and S202110478034).

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Authors and Affiliations

  1. School of Physics and Telecommunication Engineering, Zhoukou Normal University, Zhoukou, 466001, China

    Shaofeng Li, Dongmin Li, Sudang Li, Gaoliang Wang, Xianke Sun, Liuyang Xu & Honglei Yuan

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  1. Shaofeng Li
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  2. Dongmin Li
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  3. Sudang Li
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  4. Gaoliang Wang
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  5. Xianke Sun
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  7. Honglei Yuan
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Correspondence to Xianke Sun or Honglei Yuan.

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Li, S., Li, D., Li, S. et al. Local Structure and Room Ferromagnetism of Fe-Doped LiNbO3 Films. J Supercond Nov Magn 35, 2897–2902 (2022). https://doi.org/10.1007/s10948-022-06341-2

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  • DOI: https://doi.org/10.1007/s10948-022-06341-2

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