A superconducting-topological semimetal composite magnetic detector

Abstract

A superconducting-topological semimetal composite magnetic detector relates to a superconducting magnetic detector comprising a superconducting layer (1) and a topological semimetal layer (2). The superconducting layer (1) is a closed superconducting loop structure, and a section of the superconducting loop adopts a current compression region. The topological semimetal layer is a zigzag strip structure. The topological semimetal layer (2) is located inside the current compression region in the closed loop of the superconducting layer (1), and the distance between the topological semimetal layer (2) and the current compression region in the superconducting layer (1) is smaller than that of the superconducting layer (1) The width of the current compression region.

Description

technical field [0001] The invention relates to a superconducting magnetic detector. Background technique [0002] High-sensitivity magnetometers play an important role in scientific research, national defense, industrial production, and medical treatment. At present, superconducting quantum interference devices (SQUID devices) are the main detection devices for detecting ultra-low magnetic fields of fT magnitude. At present, the magnetic field detection accuracy of SQUID devices can reach below 10fT. However, the Josephson junction in the SQUID device is not easy to manufacture, the yield is low, the magnetic field linear response range of the device is small, and auxiliary electronic equipment such as flux locking is required, which restricts the large-scale application of SQUID devices. In recent years, French scientists have prepared a superconductor- Giant magnetoresistance magnetic sensor. This type of device has the advantages of small size, low noise, simple stru...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the existing difficulties in the preparation of Josephson junctions in existing superconducting quantum interference devices (SQUID devices), the small linear response range of the magnetic field, the need to add auxiliary electronic equipment such as flux locking, and the superconducting-giant magnetoresistance The giant magnetoresistance-superconducting composite multilayer film structure of the magnetic sensor is not easy to prepare, and the hysteresis effect is prone to appear in the GMR multilayer film structure. A new superconducting-topological semi-metal composite magnetic detector is proposed

The superconducting-topological semimetal composite magnetic detector proposed by the present invention can solve the problems of low yield and giant magnetism in superconducting weak magnetic detectors, including SQUID devices and superconducting-giant magnetoresistance magnetic sensors. The preparation process of the resistance-superconducting composite multilayer film structure is complex, and there are technical problems such as a small linear response range in performance and hysteresis at low temperatures.

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