Abstract
A gate-voltage-controlled high transition temperature direct current superconducting quantum interference device (high-Tc dc SQUID) magnetometer was fabricated to study how the electric field effect affects the device’s voltage-flux and voltage-current characteristics. The magnetometer consists of a monolithic YBa2Cu3O7−δ superconducting film and bicrystal junctions covered by a polymethylmethacrylate film as the gate insulator. It was found that the magnetic flux modulated voltage swing of the SQUID magnetometer varies by 48% when the gate voltage is changed from −1.9 to 9.5 V. The variation in voltage swing is attributed to the change of effective capacitance in grain-boundary junctions.
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