Pulse Field Magnetometer for Permanent Magnets

By placing the sample in a periodically decaying uniform external field Ha generated by a solenoid and in a J-coil, the magnetic moment M of Ha and the sample is measured using the induction method, and its average magnetic polarization J' is calculated. Eddy current correction is applied to J'-Ha to obtain J-Ha, followed by automatic demagnetization correction, to obtain the J-H hysteresis loop of the material's DC magnetic polarization with respect to a DC magnetic field.

Product Features

• The pulsed field solenoid provides a pulsed magnetic field of no less than 8500 kA/m, meeting the measurement requirements of rare-earth permanent magnets with high intrinsic coercivity;
• To ensure demagnetization correction requirements, this instrument is designed to ensure Ha uniformity within 0.1% in the sample;
• The pulsed magnet is cooled by oil cooling, ensuring long-term use during testing;
• The magnetic field at the center is measured using a Rogowsky coil fitted onto the solenoid leads, and the magnetic moment of samples of different sizes and shapes is measured using a specially designed J coil. The flux sensitivity of both is calibrated to an accuracy of 0.3%, allowing for reasonable correction of the J-Ha hysteresis loop to J-H using a magnetometer demagnetization factor Nm calculated to be better than 0.1% after appropriate eddy current correction;
• J coils of different specifications can be designed to meet industrial-grade measurements of magnetic tiles, magnetic rings, blocks, and other devices of different sizes.

Reference Standards

• GB/T29628-2013 Guide to Measurement Methods of Permanent Magnet (Hard Magnet) Pulses
• IECTR62331, Technical report, Pulsed field magnetometry

Standard Hardware Technical Parameters

• Pulse magnet power supply: Voltage setting range: 500 V~2500 V, Capacitor capacity: 5000 uF, 10000 uF switchable;
• Maximum magnetic field strength of the pulse magnet: not less than 8500 kA/m (Ø35 mm);
• Coil calibration accuracy of standard sample rod (Ø10 mm assembly) better than 0.1%;
• Meets the requirements for sample measurement with diameter Ø: 5 mm~10 mm and thickness H: 2 mm~20 mm;
• Multi-channel data acquisition card: 16 bit, 200 kHz;
• Oil cooler parameters: Cooling power 2.1 kW, flow rate 20 L/min, oil temperature range 16℃~60℃. 7) The configurable heating system meets the needs of high-temperature characteristic testing of samples from room temperature to 200℃.

Test accuracy and repeatability (tested under constant temperature conditions)

Test Interface

Hysteresis Loop Interface Display

Comparison of superimposed demagnetization curves of samples from different materials

Typical Test Reports

Single Demagnetization Curve Report

Superposition of demagnetization curves at different temperatures
 

Repeated testing of ultra-high intrinsic coercivity complete hysteresis loop