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Enhanced multiferroic properties in epitaxial Yb-doped BiFeO3 thin films

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Abstract

We report the enhanced multiferroic properties of a ytterbium (Yb)- doped BiFeO3 thin film (Bi0.85Yb0.15FeO3) deposited on a (001) SrRuO3/(100) SrTiO3 substrate by pulsed laser deposition. The crystal structure, surface morphology, ferroelectric domain structure, and the electrical and magnetic behavior of the epitaxial Bi0.85Yb0.15FeO3 film, 100 nm in thickness, were investigated. The results were compared with those of an undoped BiFeO3 thin film. The x-ray diffraction patterns showed that both films have tetragonal-like crystal structures. Atomic force microscopy showed that the Bi0.85Yb0.15FeO3 and BiFeO3 films have flat and clear surface steps, characteristic of a layer-by-layer growth mechanism. Furthermore, the strip-like ferroelectric domain structures were clearly observed in piezoelectric force microscopy. The Bi0.85Yb0.15FeO3 films had significantly higher remanent polarizations of approximately 73 μC/cm2 and lower leakage currents compared to the BiFeO3 thin film. Ferromagnetic enhancement was also observed in the Bi0.85Yb0.15FeO3 film at room temperature.

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Authors and Affiliations

  1. Department of Applied Physics and Institute of Natural Sciences, Kyung Hee University, Yongin, 446-701, Korea

    Yoonho Ahn, Jeongdae Seo & Jong Yeog Son

  2. Department of Nanoenergy Engineering, Pusan National University, Busan, 609-735, Korea

    Joonkyung Jang

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  1. Yoonho Ahn
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  2. Jeongdae Seo
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  3. Jong Yeog Son
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  4. Joonkyung Jang
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Correspondence to Jong Yeog Son or Joonkyung Jang.

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Ahn, Y., Seo, J., Son, J.Y. et al. Enhanced multiferroic properties in epitaxial Yb-doped BiFeO3 thin films. Electron. Mater. Lett. 11, 609–613 (2015). https://doi.org/10.1007/s13391-015-4469-3

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