Applied Physics A

, 123:563 | Cite as

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

  • Le Viet Cuong
  • Nguyen Hoang Tuan
  • Dorj OdkhuuEmail author
  • Duong Van Thiet
  • Nguyen Huu Dung
  • Luong Huu Bac
  • Dang Duc DungEmail author
Rapid communication


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.



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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Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • Le Viet Cuong
    • 1
    • 2
  • Nguyen Hoang Tuan
    • 1
  • Dorj Odkhuu
    • 3
    Email author
  • Duong Van Thiet
    • 1
  • Nguyen Huu Dung
    • 4
  • Luong Huu Bac
    • 1
  • Dang Duc Dung
    • 1
    Email author
  1. 1.School of Engineering PhysicsHa Noi University of Science and TechnologyHanoiVietnam
  2. 2.Faculty of Engineering Physics and NanotechnologyUniversity of Engineering and Technology, Vietnam National UniversityHanoiVietnam
  3. 3.Department of PhysicsIncheon National UniversityIncheonKorea
  4. 4.Advanced Institute for Science and TechnologyHa Noi University of Science and TechnologyHanoiVietnam

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