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Magneto-capacitance effects in epitaxial TbMn2O5 thin films

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Abstract

Thin films of TbMn2O5 (TMO) were grown on Nb-doped TiO2 (110) substrates by using pulsed laser deposition to investigate the effects of substrate-induced strains on the multiferroic properties observed in the bulk phase. The epitaxial qualities of the films were confirmed by using X-ray azimuthal angle scans of the TMO (201) and the TiO2 (111) reflections. TMO films were magnetically ordered at temperatures below T N ≈ 43 K, consistent with the value observed in the bulk. A maximum negative magneto-capacitance effect of about 10% at 8 T was detected near 16 K, where the dielectric constant changed rapidly with a step-like anomaly. Magnetization-induced ferroelectric phases in the epitaxial thin films appear to become destabilized at temperatures below T N due to substrate-induced tensile strains causing a weakening of the magnetic exchange interactions.

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Authors and Affiliations

  1. Department of Physics, Chungnam National University, Daejeon, 305-764, Korea

    Jong Hyun Song

  2. Department of Physics, University of Ulsan, Ulsan, 680-749, Korea

    Sun Hee Kang & Ill Won Kim

  3. Department of Physics, Pohang University of Science and Technology, Pohang, 790-784, Korea

    Yoon Hee Jeong

  4. Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang, 790-784, Korea

    Tae Yeong Koo

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  1. Jong Hyun Song
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  2. Sun Hee Kang
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  3. Ill Won Kim
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Correspondence to Tae Yeong Koo.

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Song, J.H., Kang, S.H., Kim, I.W. et al. Magneto-capacitance effects in epitaxial TbMn2O5 thin films. Journal of the Korean Physical Society 61, 1386–1389 (2012). https://doi.org/10.3938/jkps.61.1386

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  • DOI: https://doi.org/10.3938/jkps.61.1386

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