Contradictory nature of Co doping in ferroelectric BaTi O3

Patrick Ponath, Andrew O'Hara, Hai Xia Cao, Agham B. Posadas, Rama Vasudevan, M. Baris Okatan, S. Jesse, Morgann Berg, Zongyao Li, Desai Zhang, Andrew J. Kellock, Alex De Lozanne, Jianshi Zhou, Sergei Kalinin, David Smith, Alexander A. Demkov

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

The growth of Co-substituted BaTiO3 (BTO) films on Ge(001) substrates by molecular beam epitaxy is demonstrated. Energy-dispersive x-ray spectroscopy and transmission electron microscopy images confirm the uniform Co distribution. However, no evidence of magnetic ordering is observed in samples grown for Co concentrations between 2% and 40%. Piezoresponse force microscopy measurements show that a 5% Co-substituted BTO sample exhibits ferroelectric behavior. First-principles calculations indicate that while Co atoms couple ferromagnetically in the absence of oxygen vacancies, the occurrence of oxygen vacancies leads to locally antiferromagnetically coupled complexes with relatively strong spin coupling. The presence of a significant amount of oxygen vacancies is suggested by x-ray photoelectron spectroscopy measurements.

Original languageEnglish (US)
Article number205121
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume94
Issue number20
DOIs
StatePublished - 2016

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Ponath, P., O'Hara, A., Cao, H. X., Posadas, A. B., Vasudevan, R., Okatan, M. B., Jesse, S., Berg, M., Li, Z., Zhang, D., Kellock, A. J., De Lozanne, A., Zhou, J., Kalinin, S., Smith, D., & Demkov, A. A. (2016). Contradictory nature of Co doping in ferroelectric BaTi O3. Physical Review B - Condensed Matter and Materials Physics, 94(20), [205121]. https://doi.org/10.1103/PhysRevB.94.205121