利用抽运-检测型铷原子磁力仪测量软磁样品的磁矩和磁特性曲线  

Measurement of Magnetic Moment and Magnetic Characteristic Curves of Soft Magnetic Samples by Pump-probe Rubidium Atomic Magnetometer

作　　者：缪培贤 梁星 史彦超 蔡志伟 杜康 代虎[1] 刘志栋[1] 陈江[1] MIAO Peixian;LIANG Xing;SHI Yanchao;CAI Zhiwei;DU Kang;DAI Hu;LIU Zhidong;CHEN Jiang(Science and Technology on Vacuum Technology and Physics Laboratory,Lanzhou Institute of Physics,Lanzhou 730000,China)

机构地区：[1]兰州空间技术物理研究所真空技术与物理重点实验室,兰州730000

出　　处：《真空与低温》2025年第2期187-193,共7页Vacuum and Cryogenics

基　　金：国家自然科学基金(12104198、62275114);甘肃省青年科技人才托举工程(GXH20220530-11);真空技术与物理重点实验室基金(6142207220102、HTKJ2021KL510001);甘肃省人才项目(甘组通字[2024]4号)。

摘　　要：基于电磁学中磁偶极层和载流线圈在空间产生磁场的等价性原理,将软磁样品的磁矩等效为载流线圈的磁矩,提出基于位移法的磁矩测量理论,利用抽运-检测型铷原子磁力仪测量了载流线圈的磁矩和带状坡莫合金软磁样品的饱和剩余磁矩。依据软磁样品在铷泡位置产生的磁场与其磁矩呈正比关系,在恒温条件下利用软磁样品的饱和剩余磁矩值对其剩磁回线和低场部分的磁滞回线进行了标定。In electromagnetics,the principles of generating magnetic fields in space with a magnetic dipole layer or a current carrying coil are equivalent,which indicates that the magnetic moment of a soft magnetic sample can be equivalent to the magnetic moment of a current carrying coil.A new method of magnetic moment measurement based on the sample’s displacement is reported.Both a soft magnetic sample and a rubidium bubble are placed along the z-axis of a magnetic shielding cylinder,and the direction of the magnetic field generated by the sample at the position of the rubidium bubble is parallel to the z-axis.The magnitude of the magnetic field generated by the sample at the position of the rubidium bubble is defined as B',and the increasing distance between the sample and the rubidium bubble is defined as(r_(0)+x),where r_(0) is the initial distance and x is an increase in distance.The value of the sample’s magnetic moment is 2π/(μ_(0)k^(3/2)),whereμ0 is the vacuum magnetic permeability,and k is the coefficient linearly fitted by the experimental curve of(1/B')^(2/3) changing with(r_(0)+x)^(2).The magnetic moment of a current carrying coil and the saturation remanent magnetic moment of a permalloy soft magnetic sample are measured by using a pump-probe rubidium atomic magnetometer.The experimental value of the current carrying coil’s magnetic moment is 0.000265 A·m^(2),while the theoretical value is 0.000252 A·m^(2).The relative error between the experimental value and theoretical value is 5.2%,which means that the new method of magnetic moment measurement is effective.Due to the fact that B'is proportional to the soft magnetic sample’s magnetic moment,the remanent magnetization hysteresis loops and the magnetic hysteresis loops of the soft magnetic sample are calibrated using its saturation remanent magnetic moment at a constant temperature.

关 键 词：原子磁力仪 抽运-检测 软磁样品 磁矩 磁滞回线 

分 类 号：TB71[一般工业技术—真空技术]