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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 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 |
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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.
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Received: 30 November 2022
Revised: 01 January 2023
Accepted manuscript online: 08 February 2023
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PACS:
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07.55.Jg
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(Magnetometers for susceptibility, magnetic moment, and magnetization measurements)
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04.80.Nn
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(Gravitational wave detectors and experiments)
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| Fund: 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). |
Corresponding Authors:
Ya-Ting Zhang, Jia-Hao Xu
E-mail: zhangyating@hbuas.edu.cn;jhx@cug.edu.cn
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Cite this article:
Min-Na Qiao(乔敏娜), Lu-Hua Liu(刘鲁华), Bo-Song Cai(蔡柏松), Ya-Ting Zhang(张雅婷),Qing-Lan Wang(王晴岚), Jia-Hao Xu(徐家豪), and Qi Liu(刘祺) Measurement of remanent magnetic moment using a torsion pendulum with single frequency modulation method 2023 Chin. Phys. B 32 050702
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