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PhD Theses

Saúl Estandía will defend his PhD Thesis on Friday, 28 May 2021, at 11 am

The PhD researcher Saúl Estandía from the Multifunctional Thin Films and Complex Structures (MULFOX) group (ICMAB, CSIC), will defend his PhD thesis on Friday, 28 May 2021, at 11 am in an hybrid session, from the ICMAB Seminar Room "Carles Miravitlles", which will be also possible to follow online by Zoom.
Anna
May 13, 2021

Nanoscale Study of Epitaxial Ferroelectric Hf0.5Zr0.5O2 Thin Films and BaTiO3/SrTiO3 Superlattices

 

by Saúl Estandía, Multifunctional Thin Films and Complex Structures (MULFOX) group, ICMAB, CSIC

Date: Friday, 28 May 2021
Time: 11 am
Venue: ICMAB Seminar Room "Carles Miravitlles" and online session by Zoom. Register here to attend by Zoom.

Abstract: This thesis focuses on the characterization of ferroelectric Hf0.5Zr0.5O2 thin films and BaTiO3/SrTiO3 superlattices by combining scanning transmission electron microscopy, which allows to image the structure and chemistry locally with atomic resolution, with ferroelectric and structure measurements as x-ray diffraction. The first block revealed the ferroelectric dipole configurations in ferroelectric/paraelectric BaTiO3/SrTiO3 superlattices of different periods. A distinct configuration was found in the longest period BaTiO3/SrTiO3 superlattice (10 unit cell-BaTiO3/10 unit cell-SrTiO3), where unforeseen rotations of the polarization were directly imaged. The second block studied the stabilization of ferroelectric Hf0.5Zr0.5O2 on perovskite substrates. Since the discovery of ferroelectricity in HfO2-based materials in 2011 these materials have attracted much attention, given their CMOS compatibility and robust nanoscale ferroelectricity, which bears profound advantages for applications. The strong effects of the bottom electrode and the epitaxial stress on the ferroelectricity of Hf0.5Zr0.5O2 thin films were studied in detail. 

Supervisors:

  • Florencio Sánchez, MULFOX group, ICMAB-CSIC
  • Jaume Gázquez, MULFOX group, ICMAB-CSIC

PhD Committee:

  • President: Fabio Miletto Granozio, National Research Council of Italy
  • Secretary: Francesca Peiró Martínez, Universitat de Barcelona (UB)
  • Vocal: José Ángel Pardo Gracia, Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-UNIZAR

University: Universitat Autònoma de Barcelona (UAB)
PhD Programme: Materials Science

 

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