MgB2 radio-frequency superconducting quantum interference device prepared by atomic force microscope lithography

TL;DR

This paper introduces a novel fabrication method for RF superconducting quantum interference devices on MgB2 films using atomic force microscope lithography, enabling precise nanobridge creation and characterization.

Contribution

It presents a new technique combining optical lithography and AFM scratching for fabricating MgB2-based SQUIDs with detailed electrical measurements.

Findings

Critical current of 0.35 μA at 4.2 K

Successful non-contact measurements of current-phase characteristics

Demonstration of a new fabrication approach for MgB2 SQUIDs

Abstract

A new method of preparation of radio-frequency superconducting quantum interference devices on MgB2 thin films is presented. The variable-thickness bridge was prepared by a combination of optical lithography and of the scratching by an atomic force microscope. The critical current of the nanobridge was 0.35 uA at 4.2 K. Non-contact measurements of the current-phase characteristics and of the critical current vs. temperature have been investigated on our structures.