Superconducting Quantum Interference Device (SQUID)

A superconducting quantum interference device (SQUID) is an extremely sensitive instrument that can measure weak magnetic signals. As far as its function is concerned, it is a kind of magnetic flux sensor, which can be used not only to measure the change of magnetic flux, but also to measure other physical quantities that can be converted into magnetic flux, such as voltage, current, resistance, inductance, magnetic induction, magnetic field gradient, magnetic susceptibility, etc.

Sample Requirements

• Powder sample: more than 3 mg, preferably in the range of 10 - 50 mg
• 0.5 × 0.5 × 0.5 mm< block sample <4 × 4 × 4 mm
• Film sample:
• In-plane test: 1 × 1 mm< sample size <5 × 7 mm;
• Out-of-plane test: 1 × 1 mm< sample size <4 × 4 or 3 × 5 mm
• Liquid sample: The liquid volume is recommended to be 1-3 mL, then we take part of it for testing.

Application

• M-T: fixed magnetic field, test sample magnetic moment variation curve with temperature
• M-H: fixed temperature, test sample magnetic moment variation curve with magnetic field
• ZFC: zero-field cooling, and then adding field heating to test the variation curve of the magnetic moment of the sample with temperature
• FC: Add field to cool down, test sample magnetic moment change curve with temperature

Instrument and Result Display

FAQ

Q1. What temperature range can SQUID measure?

A. 2 - 400K.

Q2. What is the relevant calculation formula of DC magnetic susceptibility?

A. Magnetic susceptibility is divided into three types:

(a) volume magnetic susceptibility

(b) mass magnetic susceptibility

(c) molar magnetic susceptibility

Volume magnetic susceptibility = magnetization intensity / magnetic field = magnetic moment / (volume × magnetic field) = (magnetic moment × density) / (mass × magnetic field).

Molar magnetic susceptibility = magnetic moment / (amount of substance × magnetic field) = (magnetic moment × molar mass) / (mass × magnetic field).

Mass magnetic susceptibility = magnetic moment / (mass × magnetic field).

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