Work

Analysis of multi-center topological domain states in BiFeO3 nanodot arrays

Year: 2023

Type: article

Abstract: High-density ferroelectric BiFeO3 (BFO) nanodot arrays were developed through template-assisted tailoring of epitaxial thin films. By combining piezoresponse force microscopy (PFM) and Kelvin probe force microscopy (KPFM) imaging techniques, we found that oxygen vacancies in nanodot arrays can be transported in the presence of an electric field. Besides triple-center domains, quadruple-center domains with different vertical polarizations were also identified. This was confirmed by combining the measurements of the domain switching and polarization vector distribution. The competition between the accumulation of mobile charges, such as oxygen vacancies, on the interface and the geometric constraints of nanodots led to the formation of these topological domain states. These abnormal multi-center topological defect states pave the way for improving the storage density of ferroelectric memory devices.

Source: Journal of Advanced Dielectrics

DOI: 10.1142/s2010135x23450029

Authors: Zhongwen Li, Siyi Zhang, Qingsheng Li, Hao Liu

Institution: Huai'an University

Language: English

Topic: Multiferroics and related materials

Subfield: Electronic, Optical and Magnetic Materials

Field: Materials Science

Domain: Physical Sciences

Open Access status: diamond

Funders: Natural Science Foundation of Huaian Municipality, Natural Science Research of Jiangsu Higher Education Institutions of China, Graduate Research and Innovation Projects of Jiangsu Province

Awards: G4242873623, G7874267730, G966590465