Wake-up Free Ferroelectric Rhombohedral Phase in Epitaxially Strained ZrO2 Thin Films

• Tipo: Artigo em Revista Científica Internacional
• Data: 2021

Autores

Silva, JPB (Autor) Outra; Negrea, RF (Autor) Outra; Istrate, MC (Autor) Outra; Dutta, S (Autor) Outra; Aramberri, H (Autor) Outra; Iniguez, J (Autor) Outra; Figueiras, FG (Autor) FCUP; Ghica, C (Autor) Outra; Sekhar, KC (Autor) Outra; Kholkin, AL (Autor) Outra

Revista

Título: ACS Applied Materials & Interfaces

Vol. 13

ISSN: 1944-8244

Editora: American Chemical Society

Indexação

ISI Web of Knowledge - 0 Citações

Scopus - 2 Citações

Outras Informações

ID Authenticus: P-00V-P60

DOI: 10.1021/acsami.1c15875

Abstract (EN): Zirconia- and hafnia-based thin films have attracted tremendous attention in the past decade because of their unexpected ferroelectric behavior at the nanoscale, which enables the downscaling of ferroelectric devices. The present work reports an unprecedented ferroelectric rhombohedral phase of ZrO2 that can be achieved in thin films grown directly on (111)-Nb:SrTiO3 substrates by ion-beam sputtering. Structural and ferroelectric characterizations reveal (111)-oriented ZrO2 films under epitaxial compressive strain exhibiting switchable ferroelectric polarization of about 20.2 mu C/cm(2) with a coercive field of 1.5 MV/cm. Moreover, the time-dependent polarization reversal characteristics of Nb:SrTiO3/ZrO2/Au film capacitors exhibit typical bell-shaped curve features associated with the ferroelectric domain reversal and agree well with the nucleation limited switching (NLS) model. The polarization-electric field hysteresis loops point to an activation field comparable to the coercive field. Interestingly, the studied films show ferroelectric behavior per se, without the need to apply the wake-up cycle found in the orthorhombic phase of ZrO2. Overall, the rhombohedral ferroelectric ZrO2 films present technological advantages over the previously studied zirconia- and hafnia-based thin films and may be attractive for nanoscale ferroelectric devices.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10