In this paper, we have fabricated superconducting flux flow transistor (SFFT) with two and three channels from epitaxial YBa₂Cu₃O_7-δ thin films with thickness 350 nm and channel width 9 um and length 5 um by an Inductively Coupled Plasma (ICP). We improved the characteristics of the SFFT by forming multi-channels in the body current line. We performed the experiments and simulation of SFFTs controlled by the magnetic field generated by a gate current, which regulates the critical current through the weak link of the body current line and the gate current. We also explained the process to get the I-V characteristic equation and to induce the external and internal magnetic field by Biot-Savart’s law. The experimental results are in good agreement with simulation results. It is shown that due to the magnetic coupling between channels, the critical current of a SFFT with three channels is larger than the critical current of two channels in this study.

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1. Critical Characteristics of Superconducting Thin Films Modified by an Atomic Force Microscope
2. Nano-Oxidation of Superconducting Flux Flow Transistor Using a Conductive Atomic Force Microscope Tip