Polarization-induced resistance switching effects are analytically investigated. The electrostatic potential profile in metal is expressed by the Thomas-Fermi screening theory at the metal/ferroelectric interface. We estimate the current density using an assumed effective potential in metal/ferroelectric/metal junctions. Furthermore, we focus on the existence of a lower permittivity region such as a "dead layer" located at the boundary between the metal electrode and the ferroelectric material. In order to explain the ON/OFF ratio obtained in the experiment, we suggest that the dead layer near the smaller-work-function electrode side should be thicker by 2-3 Å than another electrode. Consequently, we propose a new hypothesis, that is, the thickness of the dead layer controls the ratio of resistance switching.
A cooling system using the electrocaloric effect is investigated on the bases of the thermodynamic theory. The electrocaloric effect causes a temperature change of dielectric materials. In this study, we introduce a simple model of the cooling system including a target object, a heat removal body, and a dielectric material. We confirm that the temperature of the target object certainly decreases. Furthermore, we propose an efficient control procedure of the electric field for cooling the target object. As a result, we show that the temperature change is enhanced by the proposed method.
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