中国物理B ›› 2023, Vol. 32 ›› Issue (5): 50702-050702.doi: 10.1088/1674-1056/acae73

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Measurement of remanent magnetic moment using a torsion pendulum with single frequency modulation method

Min-Na Qiao(乔敏娜)1, Lu-Hua Liu(刘鲁华)1, Bo-Song Cai(蔡柏松)1, Ya-Ting Zhang(张雅婷)2,†, Qing-Lan Wang(王晴岚)3, Jia-Hao Xu(徐家豪)4,‡, and Qi Liu(刘祺)4   

  1. 1 School of Aeronautics and Astronautics, Sun Yat-sen University, Guangzhou 510275, China;
    2 School of Physics and Electronic Engineering, Hubei University of Arts and Science, Xiangyang 441053, China;
    3 School of Mathematics, Physics and Optoelectronic Engineering, Hubei University of Automotive Technology, Shiyan 442002, China;
    4 MOE Key Laboratory of TianQin Mission, TianQin Research Center for Gravitational Physics&School of Physics and Astronomy, Frontiers Science Center for TianQin, Gravitational Wave Research Center of CNSA, Sun Yat-sen University(Zhuhai Campus), Zhuhai 519082, China
  • 收稿日期:2022-11-30 修回日期:2023-01-01 接受日期:2023-02-08 出版日期:2023-04-21 发布日期:2023-05-25
  • 通讯作者: Ya-Ting Zhang, Jia-Hao Xu E-mail:zhangyating@hbuas.edu.cn;jhx@cug.edu.cn
  • 基金资助:
    This work is supported by the National Key R&D Program of China (Grant No. 2020YFC2200500) and the National Natural Science Foundation of China (Grant Nos. 12075325, 12005308, and 11605065).

Measurement of remanent magnetic moment using a torsion pendulum with single frequency modulation method

Min-Na Qiao(乔敏娜)1, Lu-Hua Liu(刘鲁华)1, Bo-Song Cai(蔡柏松)1, Ya-Ting Zhang(张雅婷)2,†, Qing-Lan Wang(王晴岚)3, Jia-Hao Xu(徐家豪)4,‡, and Qi Liu(刘祺)4   

  1. 1 School of Aeronautics and Astronautics, Sun Yat-sen University, Guangzhou 510275, China;
    2 School of Physics and Electronic Engineering, Hubei University of Arts and Science, Xiangyang 441053, China;
    3 School of Mathematics, Physics and Optoelectronic Engineering, Hubei University of Automotive Technology, Shiyan 442002, China;
    4 MOE Key Laboratory of TianQin Mission, TianQin Research Center for Gravitational Physics&School of Physics and Astronomy, Frontiers Science Center for TianQin, Gravitational Wave Research Center of CNSA, Sun Yat-sen University(Zhuhai Campus), Zhuhai 519082, China
  • Received:2022-11-30 Revised:2023-01-01 Accepted:2023-02-08 Online:2023-04-21 Published:2023-05-25
  • Contact: Ya-Ting Zhang, Jia-Hao Xu E-mail:zhangyating@hbuas.edu.cn;jhx@cug.edu.cn
  • Supported by:
    This work is supported by the National Key R&D Program of China (Grant No. 2020YFC2200500) and the National Natural Science Foundation of China (Grant Nos. 12075325, 12005308, and 11605065).

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摘要： In TianQin spaceborne gravitational-wave detectors, the stringent requirements on the magnetic cleanliness of the test masses demand the high resolution ground-based characterization measurement of their magnetic properties. Here we present a single frequency modulation method based on a torsion pendulum to measure the remanent magnetic moment $m_{\rm r}$ of $1.1$ kg dummy copper test mass, and the measurement result is $(6.45\pm0.04(\rm{stat})\pm0.07(\rm{syst}))\times10^{-8} \rm{A\cdot m^2}$. The measurement precision of the $m_{\rm r}$ is about $0.9 \rm{nA\cdot m^2}$, well below the present measurement requirement of TianQin. The method is particularly useful for measuring extremely low magnetic properties of the materials for use in the construction of space-borne gravitational wave detection and other precision scientific apparatus.

关键词: remanent magnetic moment, torsion pendulum, single frequency modulation method

Abstract: In TianQin spaceborne gravitational-wave detectors, the stringent requirements on the magnetic cleanliness of the test masses demand the high resolution ground-based characterization measurement of their magnetic properties. Here we present a single frequency modulation method based on a torsion pendulum to measure the remanent magnetic moment $m_{\rm r}$ of $1.1$ kg dummy copper test mass, and the measurement result is $(6.45\pm0.04(\rm{stat})\pm0.07(\rm{syst}))\times10^{-8} \rm{A\cdot m^2}$. The measurement precision of the $m_{\rm r}$ is about $0.9 \rm{nA\cdot m^2}$, well below the present measurement requirement of TianQin. The method is particularly useful for measuring extremely low magnetic properties of the materials for use in the construction of space-borne gravitational wave detection and other precision scientific apparatus.

Key words: remanent magnetic moment, torsion pendulum, single frequency modulation method

中图分类号:  (Magnetometers for susceptibility, magnetic moment, and magnetization measurements)

  • 07.55.Jg
04.80.Nn (Gravitational wave detectors and experiments)