Nanosecond electric pulse-induced ultrafast piezoelectric responses in Co3+ substituted BiFeO3 epitaxial thin films

초록

Understanding the ultra-fast dynamics of ferroelectric materials is essential for advancing the development of next-generation high speed electronic and photonic devices. Here, the ultrafast piezoelectric response of cobalt-substituted BiFeO<inf>3</inf> (BiFe<inf>1-x</inf>Co<inf>x</inf>O<inf>3</inf>) with x = 0.15, consisting of morphotropic phase boundary of monoclinic M<inf>C</inf> and M<inf>A</inf> –type phases is investigated. The real-time piezoelectric response in (001)-oriented BiFe<inf>0.85</inf>Co<inf>0.15</inf>O<inf>3</inf> (BFCO) epitaxial thin film was monitored using the time-resolved X-ray microdiffraction technique under an applied electric field with pulse widths 70 ns and 100 ns. The BFCO thin film yielded a high piezoelectric strain of approximately 0.53 % along [001] direction, with a giant c/a ratio (∼1.26) at an electric field of 1.3 MV/cm and a pulse width of 100 ns, with a piezoelectric coefficient (d<inf>33</inf>) of 40 pm/V. This finding is an important step towards the development of a high performance lead-free piezoelectric material for ultrafast operations in advanced technological applications. © 2024 Korean Physical Society

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