Device and method for measuring magnetic characteristic curve of soft magnetic material

Abstract

The invention discloses a device and a method for measuring a magnetic characteristic curve of a soft magnetic material. The method comprises the following steps: firstly, saturating and magnetizing a soft magnetic sample by using a pulsed magnetic field at a specific temperature, then changing the distance between the soft magnetic sample and a rubidium bubble, and rapidly measuring magnetic fields at the rubidium bubble at different positions of the soft magnetic sample by using a pumping-detection rubidium atom magnetometer, so as to obtain the saturation residual magnetic moment of the soft magnetic sample; dividing the saturation residual magnetic moment by a magnetic field generated by the soft magnetic sample at the initial position at the rubidium bubble to obtain a calibration coefficient of the soft magnetic sample at the initial position under a specific temperature condition; and finally, converting magnetic field values generated by the soft magnetic sample at the rubidium bubble in various measurement processes into magnetic moment values of the soft magnetic sample by utilizing the calibration coefficient. Measurement of magnetic characteristic curves such as a soft magnetic sample isothermal residual magnetism loop, a low-field part isothermal hysteresis loop, a low-field part isothermal initial magnetization curve and a zero-field cooling magnetic moment-temperature curve is realized. The method is high in measurement precision and good in repeatability.

Description

technical field [0001] The invention relates to the technical field of magnetic field measurement, in particular to a device and method for measuring the magnetic characteristic curve of a soft magnetic material based on a pump-detection type rubidium atomic magnetometer. Background technique [0002] In the field of magnetic material measurement, various magnetic characteristic curves are used to characterize the physical properties of magnetic materials. For example, information such as coercive force and remanence can be obtained from the hysteresis loop. Phase transition, paleomagnetism and environmental magnetism are used to identify magnetic carriers in rocks or soils through saturation isothermal remanence curves and remanence coercivity curves. At present, the commonly used precision magnetometers for measuring the magnetic characteristic curves of magnetic materials are mainly the Superconducting Quantum Interference Device (SQUID) magnetometer and the Vibrating Sam...

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Problems solved by technology

At present, the commonly used magnetic performance testing system (SQUID-VSM) uses superconducting magnets to provide magnetic fields. When the superconducting magnet current is zero, the residual magnetic field can reach tens of gauss due to the frozen magnetic flux. Being able to measure can make a lot of mistakes

For example, the document "Yu Hongyun, The influence of the residual magnetic field of superconducting magnets on the testing of soft magnetic materials [J]. Acta Physica Sinica, 2014, 63(4): 047502." pointed out that the residual magnetic field of SQUID superconducting magnets is sometimes greater than 30Gs after demagnetization, The resulting magnetic field error will lead to inaccurate test data such as coercive force and remanence, and even lead to a reverse hysteresis loop. The remanence error will cause the measurement error of the magnetic moment of the soft magnetic sample under a specific magnetic field.

At present, the throwing measurement method (the throwing measurement method of the coercive force of soft magnetic materials. National standard GB / T 3656-2008) or the open magnetic circuit measurement method (the method of measuring the coercive force of magnetic materials in an open magnetic circuit) is used in the industry. .National standard GB / T 13888-2009.) to measure the coercive force of soft magnetic materials, these two methods cannot be further developed into devices for high-precision measurement of various magnetic characteristic curves of soft magnetic samples

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