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Method for increasing sensibility of superconductive quantum interference device

A technology of superconducting quantum interference and devices, which is applied in the field of increasing the effective area of ​​superconducting quantum interference devices

Inactive Publication Date: 2005-06-29
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to obtain a large effective area, these solutions have to couple a large inductance (large area) pickup coil with a small inductance SQUID, which brings a lot of matching and process problems

Method used

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  • Method for increasing sensibility of superconductive quantum interference device
  • Method for increasing sensibility of superconductive quantum interference device
  • Method for increasing sensibility of superconductive quantum interference device

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0039] First, on multiple glass substrates of 10mm×10mm×0.4mm, ferrite films of 1000-5000 Å were deposited by pulsed laser deposition, and then the magnetic film was measured with a vibrating sample magnetometer under a weak magnetic field of fT. For the hysteresis loop, choose a magnetic film with a long and narrow loop and low coercive force, and reserve it.

[0040] Then prepare the multi-turn magnetic flux transformer and dc SQUID ring: first prepare the magnetic flux transformer with three-layer thin film (YBCO-PBCO-YBCO) 14-turn input coil on the strontium titanate (SiTrO3) of φ18mm×0.5mm, first in The bottom YBCO superconducting film is epitaxially grown on the substrate, and the small-angle edge bottom film is prepared by high-incidence-angle ion beam etching; the PBCO film of the middle layer is prepared by the blocking mask method as the isolation layer; and the top YBCO superconducting film is epitaxially grown , plate the silver film for the electrode, and etch the...

Embodiment 2

[0043] In this embodiment, at first, 1000-5000 Å of 78 permalloy and 45 permalloy thin films are respectively deposited on a glass substrate of 10 mm × 10 mm × 0.4 mm by pulsed laser deposition, and then vibration is used under a weak magnetic field of fT. The sample magnetometer measures the hysteresis loop of the magnetic film, looking for a magnetic film with a long and narrow loop and low coercive force.

[0044] Preparation of magnetic flux transformers and dc SQUID rings for coupling: first prepare a three-layer thin film (YBCO-PBCO-YBCO) flux transformer with 14 turns of input coils on strontium titanate (SiTrO3) of φ18mm×0.5mm, and epitaxy Growth bottom YBCO superconducting film, high incident angle ion beam etching to prepare small-angle edge bottom film, and then use block mask method to prepare middle layer PBCO film as isolation layer, then epitaxially grow top YBCO superconducting film, first etch out The top pattern is plated with silver film for electrodes, and th...

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Abstract

This invention discloses a method to increase the super quanta intervene part accuracy, which puts layer of magnetic medium into the coupled structure of magnetic flux conversion device and SQUID to increase its magnetic flux density accuracy. Comparing with the current same area SOUID, the outer magnetic field changes one magnetic flux quanta responds to smaller field changes, which is equivalent to increase the effective area of the SQUID.

Description

technical field [0001] The invention relates to a method for increasing the effective area of ​​a superconducting quantum interference device and improving its sensitivity. Background technique [0002] The discovery of the superconducting tunneling effect has been widely valued by the scientific community and society, and the superconducting quantum interference device (SQUID) developed from it has been widely used as an ultra-sensitive detector. Years, but it was only really applied after the development of thin film technology. Using SQUID as a sensitive element to measure the change of magnetic field is the most sensitive solution for detecting magnetic field or magnetic flux at present. With the progress of high-temperature superconducting research, the performance of various high-temperature superconducting thin film SQUIDs is also improving, such as using YBCO ramp-type Josephsonjunction, PBCO barrier, multi-turn flux converter, and multi-turn Input coil coupling, fl...

Claims

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Application Information

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IPC IPC(8): G01R33/035H01L39/24
Inventor 朱学敏陈赓华周岳亮任育峰于洪伟
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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