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Observation of room-temperature ferromagnetism in Co-doped Bi0.5K0.5TiO3 materials

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Abstract

We report the band gap modification and strong room ferromagnetism by substituting the Co ions for the Ti site of Bi0.5K0.5TiO3 materials. The predicted band gap of 2.11 eV and magnetic moment of 2.7 μB/Co are reproduced precisely in UV–Vis spectroscopy and superconducting quantum interference device experiments, respectively. We elucidate the driving mechanisms for these results in terms of the spin-exchange splitting between spin subbands in the presence of substitution ions and high-spin crystal field energy spectrum. This method would provide a promising approach to get single-phase multiferroics and resolve the problem of the scarcity of single-phase multiferroics in nature.

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Acknowledgements

This research is funded by Vietnam National Foundation for Science and Technology Development (NAFOSTED) under Grant Number 103.02-2015.89 and the Basic Science Research Program through the National Research Foundation of Korea (NRF-2017R1C1B5017261).

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Authors and Affiliations

  1. School of Engineering Physics, Ha Noi University of Science and Technology, 1 Dai Co Viet Road, Hanoi, Vietnam

    Le Viet Cuong, Nguyen Hoang Tuan, Duong Van Thiet, Luong Huu Bac & Dang Duc Dung

  2. Faculty of Engineering Physics and Nanotechnology, University of Engineering and Technology, Vietnam National University, Building E3, 144 Xuan Thuy, Hanoi, Vietnam

    Le Viet Cuong

  3. Department of Physics, Incheon National University, Incheon, 22012, Korea

    Dorj Odkhuu

  4. Advanced Institute for Science and Technology, Ha Noi University of Science and Technology, 1 Dai Co Viet Road, Hanoi, Vietnam

    Nguyen Huu Dung

Authors
  1. Le Viet Cuong
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  2. Nguyen Hoang Tuan
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  3. Dorj Odkhuu
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  4. Duong Van Thiet
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  5. Nguyen Huu Dung
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  6. Luong Huu Bac
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  7. Dang Duc Dung
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Corresponding authors

Correspondence to Dorj Odkhuu or Dang Duc Dung.

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Cuong, L.V., Tuan, N.H., Odkhuu, D. et al. Observation of room-temperature ferromagnetism in Co-doped Bi0.5K0.5TiO3 materials. Appl. Phys. A 123, 563 (2017). https://doi.org/10.1007/s00339-017-1173-1

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  • DOI: https://doi.org/10.1007/s00339-017-1173-1

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