Saleem, Muhammad Shahrukh Cui, Bin Song, Cheng Sun, Yiming Gu, Youdi Zhang, Ruiqi Fayaz, Muhammad Umer Zhou, Xiaofeng Werner, Peter S. P. Parkin, Stuart Pan, Feng Electric Field Control of Phase Transition and Tunable Resistive Switching in SrFeO<sub>2.5</sub> SrFeO<sub><i>x</i></sub> (SFO<sub><i>x</i></sub>) compounds exhibit ionic conduction and oxygen-related phase transformation, having potential applications in solid oxide fuel cells, smart windows, and memristive devices. The phase transformation in SFO<sub><i>x</i></sub> typically requires a thermal annealing process under various pressure conditions, hindering their practical applications. Here, we have achieved a reversible phase transition from brownmillerite (BM) to perovskite (PV) in SrFeO<sub>2.5</sub> (SFO<sub>2.5</sub>) films through ionic liquid (IL) gating. The real-time phase transformation is imaged using in situ high-resolution transmission electron microscopy. The magnetic transition in SFO<sub>2.5</sub> is identified by fabricating an assisted La<sub>0.7</sub>Sr<sub>0.3</sub>MnO<sub>3</sub> (LSMO) bottom layer. The IL-gating-converted PV phase of a SrFeO<sub>3−δ</sub> (SFO<sub>3−δ</sub>) layer shows a ferromagnetic-like behavior but applies a huge pinning effect on LSMO magnetic moments, which consequently leads to a prominent exchange bias phenomenon, suggesting an uncompensated helical magnetic structure of SFO<sub>3−δ</sub>. On the other hand, the suppression of both magnetic and exchange coupling signals for a BM-phased SFO<sub>2.5</sub> layer elucidates its fully compensated G-type antiferromagnetic nature. We also demonstrated that the phase transition by IL gating is an effective pathway to tune the resistive switching parameters, such as set, reset, and high/low-resistance ratio in SFO<sub>2.5</sub>-based resistive random-access memory devices. oxygen-related phase transformation;La 0.7 Sr 0.3 MnO 3;oxide fuel cells;exchange bias phenomenon;SFO x;phase transition;SFO 2.5;Electric Field Control;G-type antiferromagnetic nature;transmission electron microscopy;IL-gating-converted PV phase;SrFeO 2.5 SrFeO x;Tunable Resistive Switching;LSMO;BM-phased SFO 2.5 layer elucidates;phase transformation 2019-01-21
    https://acs.figshare.com/articles/journal_contribution/Electric_Field_Control_of_Phase_Transition_and_Tunable_Resistive_Switching_in_SrFeO_sub_2_5_sub_/7660832
10.1021/acsami.8b18251.s001