利用原子磁力仪测量软磁材料的剩磁矫顽力

Measurement of Remanent Coercivity of Soft Magnetic Materials by Atomic Magnetometer

介绍了利用抽运-检测型铷原子磁力仪测量软磁材料剩磁矫顽力的实验装置和方法。在磁屏蔽筒中扫描通入磁化线圈的脉冲电流,置于磁化线圈中的软磁样品被磁化和退磁,利用抽运-检测型铷原子磁力仪监测软磁样品的剩磁状态,根据剩磁回线计算出样品的平均剩磁矫顽力。利用该方法测量带状坡莫合金软磁样品的剩磁矫顽力,十次测量的平均值为1.706 mT,剩磁矫顽力测量再现性以相对标准偏差表示为0.05%。该方法具有无零点漂移、复现性好、测量速度快、原位测量等优点,具有开发适用于环境磁学领域的磁测设备的潜力。

The experimental equipment and method for measuring the remanent coercivity of soft magnetic materials by a pump-probe rubidium atomic magnetometer are reported.The soft magnetic sample is magnetized and demagnetized by scanning the pulse current applied to the magnetization coil which is placed in the magnetic shielding cylinder.The remanent magnetization of the soft magnetic sample is monitored by a pump-probe rubidium atomic magnetometer,and the average remanent coercivity of the sample is calculated by the remanent magnetization hysteresis loops.The remanent coercivity of a Permalloy strip sample is measured by the experimental device and method proposed in this paper,the average remanent coercivity is 1.706 mT,and the reproducibility of ten repeated measurements expressed as a relative standard deviation is 0.05%.The method of measuring the remanent coercivity by using the pump-probe atomic magnetometer has the advantages of no zero-point drift,good repeatability,fast measurement speed and in-situ measurement,and has the potential to develop magnetic measuring equipment suitable for the field of environmental magnetism in the future.