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Solid-state electrochemical redox control of the optoelectronic properties for SrFeOx thin films

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Title: Solid-state electrochemical redox control of the optoelectronic properties for SrFeOx thin films
Authors: Yang, Qian Browse this author
Cho, Hai Jun Browse this author
Jeen, Hyoungjeen Browse this author
Ohta, Hiromichi Browse this author →KAKEN DB
Issue Date: 7-Jun-2021
Publisher: American Institute of Physics (AIP)
Journal Title: Journal of Applied Physics
Volume: 129
Issue: 21
Start Page: 215303
Publisher DOI: 10.1063/5.0053939
Abstract: By utilizing redox reactions, the physical properties of several transition metal oxides can be drastically changed, which is useful for developing multifunctional memory devices. Strontium iron oxide (SrFeOx), which exhibits a clear phase transition from antiferromagnetic insulator (x = 2.5) to helimagnetic metal (x = 3), is a good candidate for the active material in multifunctional memory devices. However, practical applications using previous demonstrations of redox reactions in SrFeOx are limited by the use of a liquid electrolyte due to the leakage problem. Here, we demonstrate solid-state electrochemical redox reaction in SrFeOx using a yttria-stabilized zirconia (YSZ) single-crystal substrate as the solid electrolyte. We fabricated the SrFeO2.5 film on the YSZ substrate and the applied electric current using Au electrodes. The phase gradually changed from SrFeO2.5 to SrFeO2.5+x and SrFeO3-x. The color of the film changed from yellowish-transparent to dark brown. Although the as-grown SrFeO2.5 film showed high resistivity (rho > 10(1) omega cm), the rho dramatically decreased (similar to 10(-2) omega cm) with increasing the applied charge density. Simultaneously, the thermopower greatly decreased from similar to+200 to similar to-10 mu V K-1. The present results would provide a design concept for future SrFeOx-based solid-state multifunctional memory devices.
Rights: This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in (Qian Yang, Hai Jun Cho, Hyoungjeen Jeen, and Hiromichi Ohta , "Solid-state electrochemical redox control of the optoelectronic properties for SrFeOx thin films", Journal of Applied Physics 129, 215303 (2021) and may be found at (
Type: article
Appears in Collections:電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 太田 裕道

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