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Existence of Capacitive Effects in a Tungstenbased SDC Memristive System
(Soc Microelectronics, Electron Components Materials-Midem, 2023) Dalmis, Ceylon; Mutlu, Resat; Karakulah, Ertugrul
Following the discovery of a thin-film memristive system behaving as a memristor in 2008, memcapacitor and memcapacitive systems have also been described and become hot research areas. Tungsten-based SDC (Self-Directed Channel) memristors are already in the market and have already been used in circuit applications. They are modeled with the mean metastable switch memristor model in the literature. A memristor must have the three fingerprints described by Chua et al. In this paper, it is shown that the behavior of the Tungsten-based memristors is more complex than a memristive system and they do not always meet the three fingerprints of the memristor. It has been experimentally found that the capacitive effects are dominant at low frequencies when it is excited with a square wave voltage source when the Tungsten-based memristor is connected in series with a capacitor. It is important to model the new circuit element memristor accurately. The Tungsten-based memristors cannot be modeled just as a memristive system and only with the mean metastable switch memristor model. It is suggested that, perhaps, it can be modeled considering memcapacitive effects.