Resistance switching in epitaxial SrCoOx thin films

Octolia T. Tambunan, Kadek J. Parwanta, Susant K. Acharya, Bo Wha Lee, Chang Uk Jung, Yeon Soo Kim, Bae Ho Park, Huiseong Jeong, Ji Yong Park, Myung Rae Cho, Yun Daniel Park, Woo Seok Choi, Dong Wook Kim, Hyunwoo Jin, Suyoun Lee, Seul Ji Song, Sung Jin Kang, Miyoung Kim, Cheol Seong Hwang

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30 Scopus citations

Abstract

We observed bipolar switching behavior from an epitaxial strontium cobaltite film grown on a SrTiO3 (001) substrate. The crystal structure of strontium cobaltite has been known to undergo topotactic phase transformation between two distinct phases: insulating brownmillerite (SrCoO2.5) and conducting perovskite (SrCoO3- δ) depending on the oxygen content. The current-voltage characteristics of the strontium cobaltite film showed that it could have a reversible insulator-to-metal transition triggered by electrical bias voltage. We propose that the resistance switching in the SrCoOx thin film could be related to the topotactic phase transformation and the peculiar structure of SrCoO2.5.

Original languageEnglish
Article number063507
JournalApplied Physics Letters
Volume105
Issue number6
DOIs
StatePublished - 11 Aug 2014

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