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Open Access Publications from the University of California

Structure and magnetism of Fe-doped BaSnO3thin films

  • Author(s): Alaan, US
  • N’Diaye, AT
  • Shafer, P
  • Arenholz, E
  • Suzuki, Y
  • et al.

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© 2017 Author(s). BaSnO3is an excellent candidate system for developing a new class of perovskite-based dilute magnetic semiconductors. In this study, we show that BaSn0.95Fe0.05O3can be grown from a background pressure of ∼2×10−3mTorr to oxygen pressures of 300 mTorr with high crystallinity and excellent structural quality. When grown in vacuum, the films may be weakly ferromagnetic with a nonzero x-ray magnetic circular dichroism signal on the Fe L3edge. Growth with oxygen flow appears to suppress magnetic ordering. Even for very thick films grown in 100 mTorr O2, the films are paramagnetic. The existence of ferromagnetism in vacuum-grown BaSnO3may be attributed to the F-center exchange mechanism, which relies on the presence of oxygen vacancies to facilitate the ferromagnetism. However, other possible extrinsic contributions to the magnetic ordering, such as clusters of Fe3O4and FeO or contamination can also explain the observed behavior.

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