fig2

Figure 2. Memristor structure and RS behavior. (A) Structural schematic of a fiber memristor; (B) Non-volatile bipolar RS^[30]; (C) Non-volatile unipolar RS^[30]; (D) Volatile TS^[30]. Reproduced with permission^[30]. Copyright 2017, WILEY-VCH. RS: Resistive switching; TS: threshold switching; TE: top electrode; BE: bottom electrode; LRS: low-resistance state; HRS: high-resistance state.