Double polarization hysteresis loop induced by the domain pinning by defect dipoles in HoMnO3 epitaxial thin films

D. Lee, H. S. Kim, S. Y. Jang, K. W. Joh, T. W. Noh, J. Yu, C. E. Lee, J. G. Yoon

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

We report on antiferroelectriclike double polarization hysteresis loops in multiferroic HoMnO3 thin films below the ferroelectric Curie temperature. This intriguing phenomenon is attributed to the domain pinning by defect dipoles which were introduced unintentionally during film growth process. Electron paramagnetic resonance suggests the existence of Fe1+ defects in thin films and first-principles calculations reveal that the defect dipoles would be composed of oxygen vacancy and Fe1+ defect. We discuss migration of charged point defects during film growth process and formation of defect dipoles along ferroelectric polarization direction, based on the site preference of point defects. Due to a high-temperature low-symmetry structure of HoMnO3, aging is not required to form the defect dipoles in contrast to other ferroelectrics (e.g., BaTiO3).

Original languageEnglish
Article number012101
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number1
DOIs
Publication statusPublished - 2010 Jan 8

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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