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, Cheol Eui Lee, J. G. Yoon

Research output: Contribution to journalArticle

22 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

Fingerprint

Epitaxial films
Hysteresis loops
hysteresis
Polarization
dipoles
Thin films
Defects
defects
polarization
thin films
Ferroelectric materials
Film growth
Point defects
point defects
Oxygen vacancies
Curie temperature
Paramagnetic resonance
electron paramagnetic resonance
Aging of materials
symmetry

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Double polarization hysteresis loop induced by the domain pinning by defect dipoles in HoMnO3 epitaxial thin films. / Lee, D.; Kim, H. S.; Jang, S. Y.; Joh, K. W.; Noh, T. W.; Yu, J.; Lee, Cheol Eui; Yoon, J. G.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 81, No. 1, 012101, 08.01.2010.

Research output: Contribution to journalArticle

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AU - Lee, Cheol Eui

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