Chinese
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Resistivity
Measurement principleUsing DC or AC method to measure the resistivity of the conductor sample and the response of Hall to the magnetic field. The measurement is usually made using a pulse current, that is, a measuring current is applied to the sample while a pulsed magnetic field is generated. This method can not only improve the measurement SNR, but also avoid the temperature change caused by ...
Mar.07, 2025
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Cryogenics
The cryogenic system currently used by Wuhan National high magnetic field center includes He4 system（liquid helium immersion cryogenic system) and He3 system, which can provide low-temperature conditions for scientific measurements, and the temperature range is from 500 mK to 300 K.He4 systemLiquid helium immersion cryogenic system has the advantages of simple structure, large cooling capacity...
Mar.07, 2025
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Magnets Development
Over the past few years, magnets with different peak fields and waveforms have been developed. They are listed below.65 T user fields with fast coolingThe fast cooling user magnets are designed with 10 layers of CuNb micro-composite wire developed by the China Northwest Institute for Non-ferrous Metal Research. Between the inner and outer sections, G10 rods with cross section 4 mm × 5 mm were i...
Mar.07, 2025
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Magnetization
Measurement principleThe magnetization of sample M(H) is measured by a pick-up coil surrounding the sample. The pick-up coil system consists of two series-connected coaxial coils wound in opposite directions to sense the voltage signal induced by a pulsed field. The relative values of M(H) are obtained by integration of the voltage. The absolute values of M can only ascertained through subseque...
Mar.06, 2025
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Magneto-Optical Spectra
Measurement principleIn the PL measurement, multimode optical fibers are used to transmit both the excitation and emission light beams. The PL was excited by tunable lasers and recorded by spectrometers composed of a monochromator (SP500i, Andor, or SR-500, PI) and a charge coupled device CCD (Newton 970P, Andor, or Blaze HRX, PI). For the circular-polarized magneto-PL measurements, left/right-...
Mar.05, 2025
